Please consult the other frequent questions

If you are looking for a sportsbooks site, you can use the sportsbooks search engine or the sportsbooks sites list : A-L / M-Z.

Most of bets rest on the odd principle. Every event becomes an odd, which is proportional to its good chance to happen. If someone think the event may happen, he just has to put a bet. If the event actually happens, the player will win his bet multiplied by the odd.
Most frequently bets are made on horse racing. Punter can bet on a horse he think it will win. He can also put a bet on the fact that the horse will arrive in the three first places... It is also usually possible to bet on the 2, 3, 4, 5 first horses at the arrival, in order or not. A simple bet on a winner or a placed horse will allow small winnings but with small risks (and high chances to win). At the opposite side bets on the five first horses will be very difficult but with a lucrative prize money. So there are bets for every one, at once for people whot want to win few but often, and people who want to have the opportunity to win a lot once.
For other types of event you can also choose events which should happen or other which are really less probable. For soccer, tennis, basket-ball, etc... games, you can bet on a team or on a specifical result. Some games are not based on odds but are like lottery games. Such games are hard to win but propose nice jackpots if you find all the good results.
If don't like sport, don't worry ! Bets are also organized on other events, like Madonna's next boyfriend or further presidental elections... Such bets are usual in Great Brittain. You can also find them on internet.

Bookmakers are authorized to receive your bets. You can find bookmakers easily in lots of english streets. In other countries there are usually few companies which can register bets. For example in France bets are registered by le Pari Mutuel Urbain. These companies have their own rules and bets. Some of them are specialized in horse racing and other in sport contests. Since several year internet allows you to gamble online. There are lots of sites which propose all sorts of bets, essentially sporting bets. You can of course bet on horse races. If you like sport, you will be able to bet on a very number of events, and not only the Premier League or NBA games. Basket-ball, soccer, tennis, hockey, football... Dizens of sports are available. That the same for countries, because you will not be reduced to bet on the events in your own country... There few other sort of bets if you would prefer to bet on something else than sport. In Europe several countries struggle against these new sites because they want to keep their monopoly. But federal laws evolve and these web sites will soon be totaly legal.

Serveral tips can be applied to win with betting. The main way to win is the sure bet.This technique consist of betting on a same game with different bookmakers. For example you can bet on the game Liverpool vs Manchester Utd. You have to find the bookmaker with the highest odd A for Liverpool. Then you search that who propose the hight odd B for a draw. At last you look for that who has the highest odd C for Manchester Utd. Finally you should bet $X on Liverpool with the first one, $Y on a draw with the second one, and $Z on Manchester with the last one. If Liverpool wins, you will win A*$X. If Manchester wins, then you will receive C*$Z. And if it is a draw, you will have B*$Y. You will have paid $X+Y+Z. The sure bet consists of winning whatever the result is. So you win if A*X > X+Y+Z, and B*Y > X+Y+Z, and C*Z > X+Y+Z. It is hard to find odds that can allow such a situation. But bookmakers may not consider the good chance of any team, from one to another. Because it is not easy to find these sure bets, some websites have lists of surebets. The main drawback is that you have to open account with many bookmakers...
You can also use martingale with betting games. You will have to consider the odds to determine bets. But it is really harder to apply them in relation to the roulette.