Going to Vegas for the first time...looking for tips

Will be staying on the strip at one of the big resorts later this week for 3 days.

I have never gambled before, so I am nervous. I want to play Blackjack, but I don't understand some of the stuff the dealer says. I also want to play the roulette. What is the best way to lean to play these games without looking stupid? What is the best casino for a gambling newbie?

Also looking for any suggestions on the best shows to attend while in Vegas and also suggestions for places to eat, buffets etc.