I don't know where to start

Okay, I'm in a quandary . I want to write my first slash fic but I have no idea how to start it or anything. Basically it would be Sheldon/Dr. Reid but I just don't know how to go about it. I can write Reid fine but writing Sheldon is like pulling teeth.

I hate plot bunnies...keep leaving ideas and then going their merry way. Grrr..

*le sigh*

-A-