The only good moves I can do involve noob clapping.

do a kick, It's the only thing not involving noob clapping, also grabbing with only 1 arm.

I suggest you to learn a kick, then go the freeplay do the kick with the uke.
Practice to counter that kick by a noob clap, play relax, and you'll know.
The main purpose is on relax all is your brain will automatically recognize when is the perfect time to contract, extend relax, hold things.

"How to do good move without noob clap?"

Rhetorical question, every move besides noob clap is good.
Haha, just play around in-game and get the sense of the controls. After a few weeks you'll be better ^^

Just don't quit, copy moves or be a douche. There's plenty of tutorials, players etc. out there that can help you out.
Get the muse, and play around and you'll get the hang of it eventually

Both relax and hold can be used, they're both great "tools".

Here, to help you out a little:
http://forum.toribash.com/showthread.php?t=29601

Well just mess around there is no real opener just improvising and luck