I liked Marties book but the one that helped me most with writing is this: eight characters of comedy
The book is aimed at actors and writers but as a writer, just understanding how to write a classic neurotic or other characters really helps you figure out the building blocks of sit coms. As everything it’s springboard for your own stuff and twists but if you’re just struggling to get something workable and funny together like I was, check it out.
Definitely put together some comedy scenes, but make sure you understand comedic structure first so you can really make them pop. A good book for that is The Eight Characters of Comedy by Scott Sedita.