Once you join a campaign, all you have to do is to read the rules and abide by it. There are limitations to where you are allowed to post and you cannot just keep posting anything and hoping you are going to get paid for it. No need to rush though, you are still a newbie, so you still have a lot of time to get used to how things are done. Just be constructive in your posting and when the time is due, you will get a chance.