I have little experience with Fighters in general (in 3.5, I was a ToB guy myself).
HOWEVER. Rogue Eidolon has an excellent guide here: http://www.d20pfsrd.com/extras/commu...de-to-fighters
Moreover, don't concern yourself with Intelligence overly much. If you're going Combat Expertise (if I recall correctly), you don't need more than 13 or some such. If you're worried about being a BSF from an RP standpoint, don't play your character that way (12 is above-average intelligence anyways).
Look into archetypes for what you want to do.
Previously, fighters did really well with specialization. They still do. Try looking into a trip, sunder, or two-handed specialization build. From a creation standpoint, there are a lot of options for specializing into something as a fighter, such as tanking, damage, and combat maneuvers.