I forgot to reply. My computer has been crappy lately, though.
I didn't watch Pokemon until after it was already off 4kids/kids wb, but I do remember when I was in High School Saturday Morning cartoons just... Ended.
Kids are missing out these days. A shame. Although, they're probably glued to their ipads watching YouTube or something, so maybe it's better Saturday Morning cartoons remain as a memory.
a campaign is kinda whatever you want it to be. i'd be inclined to set up a goal to be achieved, probably one that's not very complex for the first time running a thing. if you're doing custom mechanics they can be made to fit the story, but you can also borrow pointers from an established system. i would NOT rec d&d as a starter system lmao try to find or make something where you just have a few physical skills that you can put a number to.