It's quite hard to teach others how to play if you aren't there in person, almost as hard as starting anew. The best tips i can give you are these: Start out by pressing C, to hold all your joints, and then mess around and get a feeling of what the different joints does. Once you've gotten this feeling, try relaxing your joints/not holding all when starting. And most importantly, experiment. Repeating the same move over and over won't help as much as trying something new. Do not expect to be good within a few days though, it takes at the very least a couple of weeks before one can do anything. Most of those raging madmen you see, who makes it seem effortless to pluck Uke apart, they've played for over a year. Don't get discouraged by this though, see it as a goal to achieve.
Also, if you haven't done it yet, play the Fight School, it'll show you the ropes.
I'll be leaving this thread open for now, to see if other people have some tips or are willing to teach (PROPERLY).