i wanna start a forum adventure

what sort of help are you looking for?

like how should i format it and give the reader ideas for the characters to do

formatting options on this forum are pretty limited, but usually the format of image/text description of whats happening on each page works, at least in my experience. as for encouraging readers to do what you want, typically its just a matter of patience. if you want them to notice or do a specific thing, as long as you hint at it just a little the readers will figure it out by playing around with whatever it is youre putting down. dont get frustrated if they dillydally, that tends to be an oppurtunity to expand and flesh out your adventure!