Welcome to Cruise-Chat
"Deals" is a clever way the online booking engines market. I would highly recommend you find a cruise oriented travel agent and work with them. They can talk with you one on one and address all your questions and concerns. They will be able to guide you and help you make your first cruise effortless. The Enchantment is a nice ship. I went on her in 2005 right after they stretched the ship. She is an older and smaller ship than Royal Caribbean's mega ship they have today. I would recommend you at least get a family ocean view or balcony cabin. The regular ocean view or inside cabins are tight on square footage for the three of you.
Royal Caribbean has plenty for the children to do. You can sign your daughter up for her age group and she will meet others her age. Since you're looking at a three day weekend, I suspect there will be plenty of children on that sailing.
Your cruise cost will include all your entertainment and meals in the main dining room and buffet. Cokes and alcohol are extra and include a 15% gratuity. Casino, gift shop purchases, bingo, spa treatments, and shore excursions, anything of a personal nature are at your discretion. It is customary to tip the crew. Royal Caribbean will give you the choice to place your gratuities on your onboard account or pay them individually to the crew. The gratuities cover the wait staff and cabin steward. If you have them put on your onboard account it will be approximately $10 a day per person. So if you're going on a 5 day cruise, then that would be $50 for each of you for the whole cruise.
You will receive a daily program in your cabin every day. It's called the Daily Compass on Royal Caribbean. It will tell you a lot of information on what is happening on the ship, what time shows are, dining hours, etc. Read it carefully each day. Things will come more natural once you're on the ship and not be as confusing as it seems now. There is a guest relations desk on the ship whenever you're in doubt about anything.