Please help me a little with my systems analysis and design class

So I need to make five diagrams by Sunday:

Context diagram, Event decomposition diagram, Event diagram, System data flow diagram, and Primitive data flow diagram

No worries, I’m working on them. The thing is, the book has ONE example of each one. I have looked up many different examples on the web, but it’s kind of overwhelming and I was wondering if anyone had any good online resources that might help guide me a little.

Please note I do NOT want to cheat. I just want to make sure I am doing it right and maybe get some more guidance.