The Golden Nugget has a nice sportsbook. Fitzgerald's has a very small one upstairs. There are others scattered around.
For your team to win, you want to make a bet "on the money line." If your team is favored, Vegas will set the odds so that you will have to put up more than even money to place the bet. For example, if your team is favored by 3 points, Vegas will set the "money line" around -140, meaning you have to put up $14 to win $10. Conversely, if your team is a 3 point underdog, they will set the odds +130 or so, meaning if you bet $10, they will pay you $13.
https://wizardofodds.com/
This site might have some useful info for you.
Good Luck!
Neil D.