Well im guessing most of them are bots that do it, if you dont know how to do that .
Depends what you wanna do really? Do you just wanna ask questions like that? Do you want to do like fantasy football style over the course of a season? Or just want to pick one match? All matches? Prize pools etc.
You have alot of things to decide, first I would figure everything like that out first and write a post detailing all the rules and what is required, what/if there is payouts etc.