CS:GO betting is very popular now. If you are new to eSports betting, here are some tips to follow before you place your first bet:

• learn more about the game. There is no point to start betting if you don't have a clear understanding of the game basics;
  watch streams. This will help you not only to learn more about possible strategies but also to meet the best teams and players;
  start with small bets. Don't try to bet a big sum of money in the beginning. Bet only the sum that you are potentially ready to lose.

I started placing my first bets on this website. They have basic information on each popular eSports game, including CS:GO, as well as live streams.