I go to AC all the time. I can answer specific questions, if you like.
I like wizardofodds.com to understand games and some specific table rules (e.g., things you shouldn’t say or do at a certain game). There are sections on etiquette, but I’m not sure how basic it gets. That is, I don’t know if they actually cover how to get chips, etc.
I’ll cover some of your points, and some things you didn’t ask…
Get a loyalty card - Every casino has a players club. You give them your name & address. They give you a card. You then use this card when you play. The casino will track your play and award you comps (free stuff) based on your play. If you don’t get a loyalty card, there are almost no ways for the casino to comp you.
Buying chips - Go to a table with an open seat. Place your money and your loyalty card on the table. When the current betting is resolved (e.g., the hand is over and paid), the dealer will take your cash and your card. The dealer may ask you how you’d like it changed. If you’re at a $25 table and hand over $1000, you might not want all $25 chips. If you hand over $200, you’ll probably want all $25 chips and the dealer will just automatically give it to you. Don’t stress about this step. Odds are that the dealer will just give you a common breakdown and that should be sufficient for you to get started.
Making change - As you lose your money, the casino will not volunteer to change your larger chips into smaller denominations. You must ask. You do this by placing the chip(s) outside of the betting area, close to the dealer, but still in front of you (as opposed to in front of another player). Then say “change, please.” The change will be made and you will be given an opportunity to place a bet before action resumes.
Leaving the table, selling chips - When you are ready to leave, simply stack your chips. Push them towards the dealer, being careful not to place them in the betting area (lest it be thought a bet), and say “color in please.” The dealer will count down your stack and change it into the largest chips available. The change will be made and approved by you and the floor supervisor (f/k/a pit boss). Your change will be pushed to you and your former chips will be added to the dealer’s tray. Then take your chips over to the cashier (a/k/a the cage). He/She’ll exchange it for cash.
Free drinks, Tipping dealers, Tipping waitresses - Tips are appreciated and expected for both dealers and waitresses. Drinks are free, but you should give the waitress 1 or 2 $1 chips. You can get these chips the same way you make change for your larger chips. Just put up a red $5 chip and ask for $1 chips. Make the change before the waitress comes back with your drink. Don’t make her wait for you to make change, please. Tipping dealers is slightly more discretionary. It’s nice to give the dealer 1 or 2 tips an hour. Some people will only tip if they are winning. Some people tip based entirely on the service the dealer provides. Some dealers are friendly and helpful. Some are mean, cold, and mostly silent. Most fall somewhere in between. Tip what you’re comfortable with, but if you need a guideline use this one: Base your tip 1/3 on if you’re winning and 2/3 on the service provided. There’s no standard amount or percentage. $1 chips are commonly used. Avoid placing bets for the dealers, as it just reduces the value of the tip.
Don’t play craps - It’s fun. It’s exciting. It’s intimidating. You won’t know what to do, and unless you are at an empty table, the dealers can’t really explain what’s going on in a way you’d understand it.
Blackjack - I assume this is the game you want to play. It’s the game everybody understands but is afraid of etiquette. Bring a basic strategy card. Read it. Understand it. Use it at the table. Don’t touch the cards. If you don’t know the hand motions, declare your intention aloud (e.g., “stand”) and don’t move your hands around in ways that could be confused with what your intention is. You’ll pick up the simple motions just by watching other players. Most importantly, just follow the basic strategy. Try to memorize the simple cases. Don’t rely on the advice of others.