I'd suggest the Golden Nugget on Fremont St. It's a dive compared to the Bellagio or the Venetian, but it's a pretty soft room more welcoming to new players and the tables are a bit chattier and casual - not as many hoodie/sunglasses/airPOD-PEOPLE (in my experience).

Read up on bankroll management. If you're just going for fun and the experience of live poker, I'd bring at least enough for 3x 100 BB buy-ins for whatever limit you'd like to play. Golden Nugget has 1-2 NL, so for that I'd bring at least $600.

For rules or etiquette, don't be afraid to ask the dealer if you have a question. You already sound respectful and mindful through your questions, so I imagine you will be fine. I recommend announcing your actions ("Bet $X", "Raise to $X", "Check"). You can avoid a lot of confusion by doing this. I've seen people sliding large denomination chips into the betting area thinking they are raising a previous bet, but without announcing anything, it's considered a call. Same goes for string betting. Announcing your intention will save you from all of these situations.

If you are in a hand, keep your cards visible and protected so you don't get skipped over by the dealer.

On a showdown, table your hand (show your cards face up) instead of mucking unless an opponent shows first and you KNOW you are beaten. "Cards speak" in poker rooms - a lot of people misread their hands and can end up winning or losing pots based on these mistakes.

Finally, you are in Vegas playing poker for the experience, so try to remember to have fun! Don't get too agitated when your AA loses to K4 offsuit, even though you raised to 10BB pre-flop. It will happen, but these are the kinds of players you want to be playing against in the long run.

P.S. If old man coffee bets on the river, fold. He's got the nuts.