Hey, thank you for reading my comics. Coming up with ideas is definitely the hardest part. Most of the time I just have to sit away from my computer for an hour or two and think of as many ideas as I can until I find one that I like. I usually write down any ideas I have throughout the week in a small notebook that I keep so that when it's time to make a comic I can just pick the funniest idea out of that notebook.
If I'm having trouble thinking of something I try to think of random words and that can sometimes help trigger an idea. Sorry I couldn't be of more help, thinking of ideas is the hardest part about making comics for me.