I am completely with aylad on this - Salt!

More specifically, Salt Water Chlorine Generation. A SWCG electrolyses salt water to form chlorine in the pool. A salt pool is a chlorine pool.

This forum and http://www.poolsolutions.com are the best place to learn to take care of a chlorine pool no matter your preferred source of chlorine. Read up, the better prepared you are, the better your pool experience will be, especially at start-up. Note that you will need to work with your pool builder at start-up time to preserve any warranty.

One more piece of unsolicited advice: In my opinion, the most important start-up chemical for a new pool is a Taylor K-2006 testkit (accept no substitutes! - find it through aylad's sig block), followed by water.

Construction is always stressful but you're gonna love having a pool and if you learn how to take care of it here, it will be easy.