Pretty easy to get 10,000 at Caesars: https://www.caesars.com/casino-credit or at any MGM property.
You can get $10,000 at several properties pretty easy. Each property has their own separate line. I have found getting more than $10,000 right off the bat is going to be tough.
If you pay off with cash your line goes back up, if you pay with check you cannot get more until the check clears. If you leave town without paying they will send you a bill, if you don't pay your bill they wil take it directly from the account. If there is not enough in the account to cover it is considered a bad check under Nevada law.