Those machines are hard to find. Casinos don't like to put games on the floor that potentially lose money. Your best bet for finding these games is in downtown Vegas (not on the Strip) and at locals casinos, which have to be more competitive than Strip casinos in order to lure customers there away from the Strip. Here again, VPFree2 can help you find good-paying machines.
Think about how normal video poker play goes. After depositing your initial amount, you start playing hand after hand. Most often you lose your bet. The next most frequent occurrence is to simply get your bet returned by hitting a high pair (or sometimes two pairs) that returns 1 for 1. You will also hit other higher paying but less frequent hands. In each case, however, unless you hit a royal flush or other very high paying hand such as four aces with a kicker, the amount you win is not enough to cash out and be considered a good win for the day. Instead, all of these lesser wins are really just extra money that allows you to play a few more hands in order to try to win the jackpot sized hand(s).
You will also learn the layout and importance of the pay table, as well as how to properly bet while playing video poker. You will learn and understand payback, return, house (and player) edge. You will learn about the implications of variance, sometimes called volatility. You will also learn what the term random really means when playing video poker.