Sorry that I keep saying "wait for it to settle" and not telling you the 'rule of thumb' I've always followed 6 weeks should be enough time for the fill to settle - if it doesn't rain much during that time, it's a good idea to use a lawn sprinkler or weep hose for an hour every few days to help the settling - periodically soaking the fill material helps it settle.

Sorry that I have no ideas on what to do with the pool area after it's filled in