Se non ricordo male nella 3.5 quando crei un pg dal 1°lvl il primo dado vita è massimizzato mentre i successivi si tirano , vale anche per pathfinder?

Certo.

A character or creature gains maximum hit points at 1st level or if its first Hit Die roll is for a character class level.

To determine a character or creature's hit points for levels beyond 1st, roll the dice indicated by its Hit Dice. Creatures whose first Hit Die comes from an NPC class or from his race roll their first Hit Die normally.