To add to Dave's advice: Much of your builder's instructions will be about how to cure your pool's walls, which can take 6 weeks or more. For the warranty, you need to follow those instructions and therefore any problems with the walls will be covered.

Key items you'll probably be told to concentrate on will be pH, calcium levels, CYA(stabilizer) and T/A (Total Alkalinity). pH will probably be constantly rising as it cures so adding lots of acid will be expected.