Hello and welcome to TFP!

Congrats on the new plans. Exciting I'm sure. Well, when it comes to pools, the sky's the limit.... well.... actually your checkbook is the limit.

But assuming you have a basic pool layout already chosen (shape, depth, etc), I'll start with the following items for you to consider:
1 - How will you chlorinate? Don't be fooled by mineral systems, UV, or Ozone. Do some searches here at TFP and you'll quickly see why. Chlorination will be from one of 3 primary sources - Manually adding some chlorine each day (i.e. regular bleach is the same as chlorine), a Salt Water Generator (SWG) which can be automated for ease of chlorine generation, or a liquid chlorine dispenser (i.e. Stenner pump). If your builder mentions an in-line chlorinator that uses tablets, just understand those are fine for short-term use like when you're on vacation. If you use tablets too long, you drive your CYA (stabilizer) through the roof and will have to exchange water.
2 - What type of pump will you get? Dual speed, variable speed? If they say single speed, insist on one of the others.
3 - Do you care for overall automation? SWGs, variable speed pumps, and other products can be programmed for easy use. But again, those come with an up-front cost. Some folks like the technology, while others are put-off by the high-tech stuff, so it's up to you.
4 - Make sure you have adequate return jets to the pool for good circulation.
5 - I can't emphasize this enough ...... have the "proper" test kit of your own on-hand on day one of fill. We recommend either the TF-100 w/ magnetic speedstir (my personal favorite & link below) or the Taylor K-2006C. But you must have one or the other and test your own water. It is not difficult, and you'll be glad you did right from the start.
Okay, that's my lecture for the evening :blah:, nice to have you with us!