Just to make sure we're all on the same page in regards to rolling for HP, your HP total at level 1 will be...

Maximum roll for your class for HP, with an additional roll added on of that same die, and adding on the modifier for constitution as well.

So for, say, a druid... their starting HP would be 8 + 1D8 (to be rolled on here on the dice roller for proof) + con modifier.