Don't be afraid to play with bots in Standard while your learning the game. Most people that play the Competative playlist have around 100+ hours of gameplay. Big Team sometimes has some nice games, but standard is usually the easiest way to learn the game.
^This
Bots used to do a crappy job of preparing me for multiplayer with actual people, but since the patch, they've gotten better.
Feel free to add me, I'm on a lot, and can always use more Brink buddies.