My 2 question refers to time.
I’m playing a level 1 Master Summoner, and Summon Monster
is 1 full round to cast.
If I take the feat Fast Spell and make that full round action
a standard action then.......
1) what can I do in that remains time?
2) And when would The summoned creature show up?
Fast Spell isn't a Pathfinder feat as far as I know.
There are legal cases where creatures can be summoned as a standard action. In this case, the summoned creature appears immediately and can act immediately. So you can take a move action then summon, or summon and then take a move action.
A summoner can cast summon monster as a spell like ability that only takes a standard action to cast. So no extra feat required.
1) In a given turn, you can have a standard, move and swift action and an ambiguous number of free actions.. So, if you use a standard action to summon a monster then you can still use your move and swift action before or after your standard action.
2) A summoned creature arrives and can act as soon as the spell is finished casting. If using a standard action, then it would arrive and act on your turn. If using a 1 round casting, then it would appear and act at the beginning of your next turn, leaving you free to take all of your normally allowed actions on that next turn.
Bonus) The summoner's spell like ability already allows them to cast a summon spell as a standard action a certain number of times per day. The summoner could still use its regular spells for even more summonings, though this is not commonly done. In general, you can't use metamagic on spell like abilities, though in this case you wouldn't need to use Fast Spell on the Summon Monster spell like ability.
Advice) If you are new to playing a summoner, you need to be careful not to bog the table down with constantly looking up monster stats. You should create a sheet that has your typical stats of anything you want to summon: Attack Bonuses and Damage, AC, Saves, HP, CMB and CMD. If these values get modified by your feats, then you will only want your modified values.
Advice2) There are a lot of great feats for playing a summoning character, but the first you will want to reach for is augment summoning, which has a prerequisite of spell focus(conjuration). I wouldn't recommend going for any other feat until you get that one, and then there are many other great options, like superior summons and evolved summon monster. This assumes you are basing your summoner around the summon monster spell like ability, which you almost certainly are doing if you chose the master summoner.
Advice2) There are a lot of great feats for playing a summoning character, but the first you will want to reach for is augment summoning, which has a prerequisite of spell focus(conjuration).
Master Summoner gets Augment Summoning automatically at level 2, and doesn't need Spell Focus(Conjuration).
A summoner can cast summon monster as a spell like ability that only takes a standard action to cast. So no extra feat required.
The Master Summoner archetype appears to replace the standard summoner ability that makes it a Standard Action with an alternative version that allows more uses and more monsters simultaneously.
This ability otherwise functions as the summoner’s normal summon monster I ability.
So, it should still be a standard action.
I had forgot they got augment for free though. I've never had a group I hated enough to subject to a master summoner.