One nice thing about video poker is you can know the return of the machine even before you start playing. On a typical video poker game, the casino's average profit on each play is about 3%. That's called the house edge. The return is the part that's returned to the player. So if the casino gets 3% of all money bet, the players get back 97% of all money bet. The return on a video poker machine is determined by the paytable. Just compare the paytable to the list at Wizard of Odds and you'll see that, for example, the Jacks or Better paytable above means that the return on that machine is 99.54%. If the paytable showed only 8 coins for the full house and only 5 for the flush, it would be a 97.3% machine.
A straight is a hand with consecutive ranks, like 9? 7? 10? 8? 6?. Notice again that the cards don't have to appear in order. The order of face cards, from lowest to highest, is Jack, Queen, King, Ace, which we abbreviate J, Q, K, A. An ace can also count as 1, to complete a straight where the other cards are 2, 3, 4, and 5. But it can't count as both a low and a high card, e.g., Q K A 2 3.