Ugh... I am definitely not a fan for using thrown weapons, especially ones with a bit of weight, on a character with very low strength. Truth be told, I would rather suggest going with a class that can use this very high wisdom, maybe like a warpriest. The thing is, with 3 weapons and a chain shirt you are already likely encumbered, so it is going to be quite hard if you cannot juggle scores and change the class.
Ranged attacks can be powerful, but it is a very feat intensive style. If you do damage at ranged, point blank shot, precise shot and deadly aim need to come pretty early, and two-weapon fighting is pretty important as well. Quick draw will also be important, for obvious reasons.
The thing is, I cannot really recommend this character class with these stats and this style. To be quite honest a wisdom-based character with 6 or 9 level spells (i.e. druid, shaman, inquisitor, warpriest/cleric) would work better. Starting with deadly aim and point-blank shot is not a bad idea, but even then, you can only take this character so far.
Advice for Axe-throwing Slayers?
Thrown weapon builds are incredibly difficult to do well, and require you to be a Fighter (or have Fighter Weapon Training) or use a blink back belt. Even returning weapons don't really work well since they return at the end of your turn, not after your attack.
With those stats and the class you have....I think an archery build is going to be better, but it's going to be difficult no matter what.
An attack (or two at -2) for 1d6-1 damage - OK, straight 1d6 if you activate studied target - is pretty terrible. That's 'please stay out of combat so we don't waste healing on you' if there's anyone in the party with an 18 strength.
If you're set on two axes then there's not a lot you can do to get around it either. Sliding Axe Throw isn't good but it does give you something which isn't damage to do. Piranha Strike raises your damage a little. Point Blank Shot opens up other ranged feats, it's a better bonus than piranha tho' only at range, and you're going to need it sooner or later if you're fighting at range.
If you're willing to switch to pure archery life's going to be easier in a few levels. The thrown style isn't going to get any easier.
Mobility would be nice but you're going to need your feats for other stuff. Put that idea on ice.
Eugh.
My recommendation is you take a long, hard look at the throwing axes. I occasionally pick up a throwing weapon on a martial character, but its really only to give me an option if I can't reach an enemy with a better attack I specialized for. Throwing weapons have pitiful range and you'll take a -1 penalty to damage for your 9 strength on your 1d4 small sized axe. Additionally, this build only begins becoming viable as you dump feat after feat into a ranged chain with no payoff. If you're dead set on doing this, I would make it an action when you have absolutely nothing better to do in combat.
You can use your slayer talent to pick up a Exotic Weapon Prof. - Net. Entangled is a nice debuff for a martial character to be able to toss on people.
The way I see it, you absolutely need to be maxing your Acrobatics, Bluff, and Stealth skills. These skills best set you up for being able to perform sneak attacks, which is the chief way you'll be dealing damage as a Slayer. Acrobatics is pretty straightforward for allowing you to move to set up flanks in combat, but Bluff is useful for both Feinting (look it up if you're not familiar) and setting up sneak attacks from dialogue. Stealth is also obvious, but also allows you to do cute things like palm daggers, walk up to someone, and casually sneak attack.
Two Weapon Fighting isn't a great style in my opinion but for a dex build with sneak attack there isn't really a better option. Again, use this to take full advantage of your sneak attacks, but remember you need a full round action to make both attacks without the benefit of Pounce.
I'm late for bed so I think I'll leave the rest to you. Best of luck!
You could make an OK Slayer with those stats in melee, but throwing weapons... that's almost as brutal as creating a Wizard that doesn't have enough intelligence to cast his spells. Deadly Aim is the only way to really add much to damage, but then you're taking a double penalty from Deadly Aim and two-weapon on a build where accuracy is already not great.
If I had to make an effective Slayer with those stats I'd probably go for one level of Urban Barbarian and some Extra Rage for the +4DEX and Furious weapon, pick the Two-Handed style to get Power Attack and maybe Great Cleave without the prerequisites, and then grab a rapier with Fencing Grace or something similar.
As a DPR based combatant I would suggest you up your constitution to 14 at a minimum. That would give you more hit points, and if you do anything meaningful the enemies will attack you. Those +'s add up over several levels. You also have low strength so that also hampers you.
PS: If your GM is not going to allow you to rework(not reroll) your ability scores then finding a way to get dex to damage and/or going with a ranged style such as archery will likely be better. Throwing weapons are more feat intensive than archery and TWF if you want to be decent at it.
I'm pretty much stuck with it until it dies, I don't like this either but I'm really feeling I should at least make an effort to make it sort of work.
Well, you can, but tbh I am not keen on thrown weapons with these stats. Can you multiclass :P ?
If no, archery or even crossbows (since you are not going to be adding strength to damage any time soon) are a better option for a ranged character.
If you can hand-wave the alignment restriction, Far Strike Monk is a really good 1 level dip for throwing weapons. You can obtain Quick Draw and Precise Shot.
As a level 1 Human FSM, my throwing build has Point Blank Shot, Precise Shot, Quick Draw and Dodge, which is nothing to sneeze at. With Flurry of Blows you don't even need to pick up TWF.
Just some food for thought.