I can help as well. Seeing as I am currently making an abridged series, let me nswer some of the questions for ou.
An abridged series is exactly like a spoof of a movie. You take a cartoon, most popular ones are animes like naruto and yugioh, and you rewrite the script for one of the episodes. You can follow the plot of the original episode, or you can completely ignore it. The whole idea is to make a comic show that kind of makes fun of the show's faults. For example, in my Land Before Time abridged series, I am making comment to the fact that the characters don't get any older throughout each movie. However, you don't want to completely change the character's personality, otherwise it ruins the episode. Also, throughout an abridged series, you break the laws of the universe by making cultural references, like other movies or tv shows, songs, or games.
The whole idea is to make a very funny show. Hopefully this answers some of your questions.