About money management, I could tell you one thing, don't go all-in even if you're 100% sure you'll win. You should know how much money you allocate on betting. If you're betting with money you collected from the bookmaker, you're doing a good job.
You're absolutely right. Moreover, according to the theory of probability it's better to spread your money between few matches in which you're sure enough because in that case even if one bet is wrong you'll get more then you lose.