Is there anywhere I can learn about tactics?

Have played the game since the CM days... but now things are alot more complex with all the different roles a player can play in each position, the same tactics have always worked up untill this version of FM. I've played 2 seasons with ManU and can't finish any higher than mid table. Im obvo not doing something right lol.. Is there a place where I can learn more about how the tactics/formations work and which would work best with my team?

Only player i've bought is Rene Adler (Goalkeeper) my team is very inconsistent at winning.

Tactics and training forum is what you are after.

Yes, Andy H is spot on. Try here - http://community.sigames.com/forumdisplay.php/18-Tactics-amp-Training-Tips

I recommend the sticky thread T&T '10 at the top of the forum. Also Woifsong's team talks thread is very good.

That should help for starters.

Tactical Theorems '10 helped me a lot. Read it calmly, experiment tactics and the advices given there and you'll learn lots of useful things

Everything that has been mentioned above, but i would also look into other areas than just the tactics, motivation is a big thing as well.

The Tactics Forum really will be a revelation to you. The Tactical Theorem guide (free download) is a big thick pdf file of loveliness. Once you understand the depth of tactics in FM you'll never play the game in the same way. The whole forum is a massive education. Johnjo is also correct - player personalities and their management play a big role too these days. Keep perusing the more cerebral threads in the forums and get a thorough education.