Look at the advice forum. There's the guide to guides and plenty of good summoner guides worth checking out. I flagged your post to move to advice.
Of course you can. Just take the prerequisites and you qualify for the feat. And of course it must have the appropriate appendages through evolution.
No, unarmed strike is just a feat tax if you choose not to use it.
And the Eidolon can have appendages that do not have claws. I think that would qualify as an unarmed strike if you must make use of the feat.
Foreheads count for unarmed strikes, type and number of limbs is not important.
You mentioned PFS legal, so is this an unchained summoner? I believe that is the only legal summoner for PFS, if so, what subtype is your eidolon?
Unchained is easier to build, but weaker. If you are playing PFS it is required, if you just reference PFS for guidelines on the advice you want, then I wouldn't use unchained if your GM isn't requiring it.
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It depends entirely on what style you want to use. Manufactured weapons? Natural weaons? And either way, do you want to focus on one big attack or multiple attacks?
Single Manufactured: Weapon Proficiency and Power Attack. Greatsword and Falcion are the most popular choices, but any 2hander or even 1hander works. Consider Combat Reflexes if you use a reach weapon.
Single Natural: Power Attack and Combat Reflexes. Get a Bite and pimp it out with 1.5 Str Mod damage, Reach, Improved Damage (the feat and the evolution) and maybe Grab. An Amulet of Migjty Fists with the Impact enchant makes the Vital Strike feat line amazing. Weapon Focus is cool.
Multiple Natural: max attacks with Claws and Bite. Your 4 limbs can keep you at the cap for the majority of the game. After that, Power Attack and Weapon Focus (Claw). Also the evolution for elemental damage added to your natural attacks. The only wituation where I think an Amulet enchanted with Flaming or Frost or whatever is worth it.
Multiple Natural: impossible, as PFS bans Multiweapon Fighting.
Other than that? Iron Will and Lightning Reflexes are alright. Weapon Master's Handbook has a few fun options but you may not have the spare feats. Large Size evolution is amazing on every style but it does not resize weapons. Plan accordingly.
Bonus: Make a Multiple Natural eidolon. At level 9 grow some arms and buy a Large 2hander. Classic Eidolon max attacks do not apply to weapons. Enjoy shredding all the things. At Huge size you can still use a Large weapon as a "1 hander" and grip it in both hands. The penalty is negligible.