Boxing Combinations

I just started taking boxing/MMA classes a few months ago. Since they are expensive I am trying to train as much on my own with my heavy bag and speed bag.

Can you guys recommend some basic combinations to pracitce on the bag. These can include knees, kicks, and elbows, if possible.

Thanks for your help.

Watch all the boxing you can find on TV, its on practically everyday, check ESPN classic for some good fights. I would also recommend getting some videos of Muay thai, and Mixed Martial Arts videos/dvd. On top of that, there is a good book called Boxing: The American Martial Art .. its a whole 12 week boxing program, great stuff.