Recommend a cheap/easy/first timer guide for Fridge-Pickling?

I get fresh produce free fairly consistently. And I got a free jug of white vinegar. Might go out today or tomorrow and pick up some mason jars.

Where do I go from there? My spice rack isn't great, and this is more of a test-run so I'm looking for a simple option, first time 'round.

Right now I have some hot and bell peppers, mini cucumbers, weirdly large snow peas, and some very green tomatoes I'm hoping to use.

Cheers