The manual is meant for teams of newbies, who don't know where online tournaments in CS: GO

http://csgo.starladder.tv/ - the most popular of the CIS League, broken into 3 divisions: AM/PRO/STAR. For novice teams will be available to the Amateur(AM) division. to play PRO division you need to be among the best AM division. Well, to get into STAR division, you need to get into the top 1-2 PRO division.
The format of the tournament: 5x5.

http://play.eslgaming.com/counterstrike/csgo/ - Tournaments from ESL. Also held the auditions for the major world and European Championships.
The format of the tournament: 5x5; 2x2; 1x1.

https://faceit.com/ - The site on which there are daily many fastcup's cs:go . It also hosts the auditions for the major world and European Championships.
The format of the tournament: 5x5.

https://weplay.tv/tournaments/cs-go - The site on which periodically holds tournaments on cs:go.
The format of the tournament: 5x5; 2x2; 1x1.

The list will be replenished.
The guide is not created for the purpose of advertising.
Offer in the comments sites which are not specified in this manual.
Sorry for my bad English:) my friends