Your race doesn't affect hp. Hp is calculated by class.

Gecko: I think it would be easiest to roll the die first then write your post around that. It would prevent the kind of backtracking doing it the other way would cause. And the DC is 14 for the Sleight of Hand check.

For your knowledge check, the man who gave you the clothes and made the little speech about playing nice is Warden Warren Hunter. He runs the prison, which is funded by the government of Korvosa. While only human, he is reputed to be a skilled warrior in his own right.