Hello, and welcome to comp tf2! I help run the newbie mixes. We meet every Friday night from 9 PM est to 1 AM est to play games. Basically, you get partnered up with 5 other "newbie" players and a coach. So you have a full team of players that are roughly your skill level and a coach that has considerable experience in TF2 watching over you and helping you out.
Info on how to join and play in mixes can be found on our steam group page: http://steamcommunity.com/groups/na6v6newbiemix
I'd also recommend you get an FPS config to improve your framerate. You are at a considerable disadvantage at such a low FPS. You can get one of comanglia's configs here: http://www.teamfortress.tv/25328/comanglia-s-config-fps-guide You can also ask any questions you have about the configs in that thread.
Best of luck, and always feel free to PM me on TFTV if you have any questions about getting into tf2!