Consider yourself lucky that the builder isn't offering any help. This is your opportunity to learn everything yourself following the methods on this site which don't coincide with too many other people out there.
You don't have to worry about the salt water generator until the pool's chemicals are right where you want them. There is a startup procedure for plaster pools, but from your post it looks like you have a pool with a liner, so I don't believe there is anything extra you have to do at startup. I may be wrong and I'm sure someone more knowledgeable will chime in soon.
To do this right, you need your own quality test kit. We recommend either the TF-100 or the Taylor K2006C. These are the only two kits out there that have the oh so important FAS-DPD chlorine test. All other test kits use an inferior chlorine test that only goes up to 5 PPM (parts per million). Order one right away. It will be the best $70 - $100 that you will ever spend on your pool and will save you a ton of money so you won't get duped at the pool store buying snake oil potions that you don't need.
Once you get your pool filled, pour in enough 8.25% bleach or 10% liquid chlorine to get your free chlorine (FC) to around 3 PPM. Then add enough stabilizer (CYA) to get to 30 PPM. The stabilizer will act as a sunscreen for your chlorine so the sun doesn't burn it all off right away. Add it by pouring the granules in a sock and hang it in front of a return with the pool running. Give it an occasional squeeze every few hours and it will dissolve within a day or so.
Check your FC with your test kit and add enough bleach to get it up to the 4 - 6 PPM. Then check your pH and add muriatic acid if it's 8.0 or above to drop it into the safer 7.2 - 7.8 range. Then run a full set of tests with your test kit. These will include CH (calcium hardness), TA (Total Alkalinity), and the CC (combined chloramines) test.
Once all your tests are in the right range, we'll tell you to increase the CYA up to the 70-80 PPM range for the SWG and get that ready to be brought online.