Raid Tactics

Hey guys. I am new to Wotlk raiding and dont know a *#@* about it. And I will join one of the realms top raiding guild as tank. And wonder if you can give me some raid tactics for naxx and malygos and all the other bosses.. A website where you can do your homework.. Im not new to raiding only wotlk raiding..
Tho never had a chance on Naxx from the old days, was to lazy to do the attunement ,/

Thanks!