Wizbang is spot on.
PH p 58-59 lays out the progression of how to level up: Step 1 - choose class, Step 2 - BAB, Step 3 - Base Save Bonus, Step 4 - Ability Score, Step 5 - HP, Step 6 - Skill Points, Step 7 - Feats, Step 8 - Spells, Step 9- Class features.
Going in this sequence, you need to...