Well, I'm no expert at this it took me a long time to learn how to post pic's. I have to use photobucket, I think it will auto resize the pic's for you but not sure. I just go to edit at photobucket and hit resize for message board.
Hopefully someone who knows more can jump in and give better advice.
The guy's helped me out alot and here is were I learned
It's toward the end I think