Rollete i dont think experience will matter .Maybe Luck cause it depends only in the program set by the gambling house maybe most of the time its a loss ex 20loss is to 10 wins only. Poker is much better good game if you are well experienced gambler.
There are no "sequences", you can't predict what their random number generator will roll on its next bet. Bet size also doesn't matter, what matters is your wagered amount, big number of small bets is the same as a few big bets. And no matter what you do, there will always be the house edge which will not let you have reliable profit over the long run.