Think of each one of your jokes as a complete story. It must have a beginning, a compelling middle and a *definitive end.
*(punch line of some sort..hopefully killer)
All with as much originality of material and original character and passion you can muster.
And YES! EACH of your jokes should have this rhythm. And don't give me the old, this is too much to remember thing. It will help your memory to write and visualize using this method.) It will also aid the linking of topics together to create 'theme' bits and entire blocks of material.
Writing Tip: The best jokes play on the extreme boundaries of EVERYTHING ... especially emotions. Emotional moments get the biggest laughs.