Interesting question. Firstly I would like to inform you that you know nothing of sports betting. I will explain a little and encourage you to go no further. How does a bookmaker make money? They asses the likelihood of one team winning over another, lets say its an even money match and both players/teams have an equal chance of winning, imagine that match is played one hundred times, if the bookmaker has the odds right they will each win roughly 50 times. Book the bookmaker will not offer you the opportunity to double your money on such a match, they will pay you out at odds of 1.91, for every 50 you bet you will win 40ish (and get your 50 stake back), so lets say you kept betting on your favorite team, 50 times it loses, 50 times it wins, of course as your payout is less than the match odds over time you lose, perhaps not straight away, but gradually you will.
Bookmakers make money by paying out at less than the odds of a specific outcome. So to beat the bookmaker you will need to find a match where the bookmaker has set the odds wrong. You need to find a bet that has value, to find a value bet you need to be an expert in that particular sport. When a sports book player reaches long term profit there account is limited but they are still allowed to play as sports books watch what bets they make and then lowered the odds on that outcome, so not only do you have to beat the thousands of bookmakers but also you have to beat the hundreds of thousands of "sharp" players who know what they are doing.
The profit margin set by a bookmaker is generally around 10%, the clueless player taking on a sports book can expect to lose ON AVERAGE 10% of his money each time he makes a bet, the profit margin on a roulette wheel is around 2.5% so to be quite honest take your money to a roulette table if you must insist on wasting money gambling. In summary: You would be a fool to place a wager with the amount of knowledge you have, and you would be a fool to believe a sharp would give away a tip anyway, since they will only be able to average around 10% profit themselves!
I work in a bookmakers, which have professionals working in the back and I trade sports bets.