Hopefully you will not regret that last sentance, here the first question?

What am I leveling the bottom of the floor to?

should I try to make it even with the top of the bottom rail? or maybel level with highest point {which may reduce the size of the wedge of dirt that buts up against the side wall)?

Sorry for asking so many questions about what is probably a very simple task to someone who knows what they are doing?

thanks