We are going to get a 24ft pool installed but have some slight water issues in the backyard. We have been told we can have them level the ground since the yard is on a slight slope and then build up the pool on crushed stones and sand. Does this work? Or should we do drainage around the pool. Husband wants to build up only.

I have never met an installer who advocates building a pool on any kind of fill including gravel. When you yard is not level you dig down on the high side. I'd get some additional bidders on this job before you get soaked.