Here is a website with a telephere set on it:
http://www.magic360.com/telesphere.html
It looks pretty nifty though be sure to make it magically do what you don't "want" it to do or make it look a lot more difficult then it does. For instructions, I suggest looking up "telesphere magic trick" on yahoo, and finding a real shop that has it, and e-mailing the owner, explaining your situation, and they might tell you (stupid magicians oath.
As for new stuff. There are a bizillion books and websites out there on magic. What I have been doing is just browsing them, and figuring out what I like, can do and make funny.
My best stuff is finger tricks. Besides the normal pulling off and stretching the thumb sort of things, I have made up a "card" finger trick. My fingers are shuffled cut, and fanned. Then I close my eyes and have a spectator choose a finger and hold it up where every one can see. They almost invaribly choose the middle finger (at least my friends do). I then tell them to put it back. I open my eyes and I shuffle again. I then fan out my fingers with the selected finger mysteriously gone. I ask them if they can see the finger they selected. They can't, so I then try and find it, looking in my pockets, behind furniture, behind peoples ears, in vases whereever. Then I come back to the person who chose the finger, snap my fingers and say "Oh there it is!" and show that the finger has magically transfered to the spectators hand! How I do this I cannot reveal.
So magic especially clown magic doesn't have to be expensive or complex, or even there. It just has to be entertaining and funny.