If you're wondering how to play a Human then you've got bigger problems than character generation in Pathfinder. I'm not going to waste time discussing how to be a Human. Rather, let's look at the different Human bloodlines and cultures and in Golarion so you can pick the country and culture you want you're PC to belong to.
Human Races of Golarion
- Chelaxian - A mix of pale-skinned northerners and duskier southerners. Diabolic culture with a sense of Entitlement. You're party's self-elected aristocracy.
- Garundi- Black race, inheritors of ancient glories. Populated what is Osirion, Golarion's ancient Egypt among other lands.
- Kellid - Conan the Barbarian in Golarion. That pretty much nails it on the head.
- Keleshite - Think 'A Thousand and One Arabian Nights'. The romantic Middle East - ancient Baghdad and Persia in Golarion.
- Mwangi - Think jungles of Africa, primeval tribes close to nature.
- Taldan - The rich kid of the party. Dusky skinned, formerly the top post-Azlanti civilization in Golarion; now a bit eclipsed by once-colony Cheliax. Rich kid with a chip on his shoulder.
- Tian - We can't have Golarion without Asians right?
- Ulfen - The Vikings.
- Varisian - The Gypsies.
- Vudrani - The Indians (as in subcontinent of India)
What It Means To Be Human In Pathfinder
You get to put +2 in an Ability of your choice; a Human characteristic also inherited by the half races.
Humans learn faster than the other races and this is reflected by extra feats and skill ranks for Humans.
And that's pretty much it for the most boring race in Golarion.