I ride it for about 5 miles a day to work with my Single Speed bike.
on the way back it can be a bit steep so it would be nice to minimize sweat and use electric engine to help me bike.

here is my bike:
http://www.bikesdirect.com/products/.../clockwork.htm

I am a total noob to the conversion methods or kits.
Do I have to replace my tire to use any of the kits?

any guidance would be great!