Example Book 1: Idea

I have always had a dream to make a full story... To do that I need to start with plotting or I get lost so help me out!
I may make a series of these where Ill have a vague title or just do liek book 1 idea or smth and then do book 1 fmc, book 1 mmc, book one setting etc etc. Where Ill give you my vague ideas and you help me fill I the gaps. I promise it'll make more sense when we start