We are about to build an in ground pool and am looking for any advice. This will be our first pool and would love to know what is best. We have 2 girls ages 2 and 7 and want a pool that is great for these ages and for them to grow into.

For example, chlorine or salt? and why?
What accessories would you suggest are must haves?
How big and deep would you suggest? We have plenty of space for any size and want a decent size but not spend a fortune.
Really, any advice to help make this process easier?