Link me to a tutorial on making stopmotion models (+where to get supplies)

I want to start making stopmotion shorts but I don't know how to make the models. I did make one 10-second animation with an old toy car and a War of the Worlds-type alien I made out of tin foil, but if I want to make something legit. Give me a crash course on modelling, what materials I'll need, and where to get them.

Side note: I never attended animation school, I'm not sure they even exist in my country

My animation:
https://youtu.be/eh6mPozDVr0

Ja san robot hobotnica, dica su u opasnosti od moje masnosti