For as long as I can remember, I have not been a fan of RTS'. Admittedly, i have only played them a few times, but i didn't really enjoy them at all.
On the weekend, I saw one of my friends playing some Supreme Commander online, and watching him nuke the shit out of a guy who was trying to ally with him and the consequent nerd rage piqued my interest. The problem is that all of my friends that play these games play them at a hardcore level, so playing with them is retarded, especially since I have no grasp of what i should be doing at any given time.
Basically, how do you think I should approach this genre? I have a PC that can run pretty much anything, where do you suggest I start? What are some of the simpler RTS' that can teach me the fundamentals? I'm sure there are a few RTS nuts here who can help a brother out.

