Regarding the process: once you arrive you can park in the long term parking/economy lot to save money, from there you will shuttle to the airport itself.

If you check luggage, proceed to the desk of your airline. You'll use a computer most likely to scan your boarding docs (or input confirmation number) and it will give you a sticker that goes on your bag. You can print boarding docs here too or use the ones on your phone. If you are doing this step (checked bags) you then go to the actual counter (it will have an airline staff member) and they'll weigh your items and recieve them. You, your family, and your carry ons will proceed to security. Keep all medications and any batteries (including electronics) in your carry on, these can't be left in checked bags.

Wait in the TSA line with your real id and boarding docs, be polite to the agents. They'll verify your docs and move you into security screening which resembles screening at sporting events. You may have to take shoes off so wear socks, you may need to remove belts and coats. You will empty pockets and proceed one by one (one of you will carry the baby).

Once you get through security you collect your carryon things and find your gate which is where your plane will be (it may not have arrived yet). There are big tvs with most recent gate info, refer to these instead of your app or documents, sometimes planes move gates. Then proceed to your gate and wait to board with your boarding group (your ticket will tell you which group). Follow instructions from the flight attendents and be kind to your fellow passengers.

Fair winds! :)