Having trouble turning your ideas/premises into jokes???
One of the easy ways is to simplify everything. Don't exclude the ol' SETUP-PUNCHLINE method.
(A basic joke is an INTRO, explaining what your topic is.
This is called the SETUP -keep as short as possible. Such as....)
MY NEW GIRLFRIEND
(Now that you've introduced your topic set audience up with a line that sounds like you're saying something sweet).
I CAN'T GET ENOUGH OF HER.
SHE'S BEAUTIFUL, SHE SEXY, SHE'S RICH...
(-turn on the smart ass and twist on audience...)
*Try using this simple formula to get the ball rolling for you! It still works for me. I write a simple joke and then when I have a punch line of some sort to work with...I can reword it, complicate it, expand it, etc. etc.
Once you have the blue print of the joke along with a punch line you can always change it up, or put it together with another joke in a similar theme to begin building bits.