that is very simple procedure but first you have to check if you are going to apply for a signature campaign that if they accepting newbie in their campaign or not, because there are so many campaign who are not accepting newbie in their signature campaign.
The procedure of joining a campaign is really simple as you said, but the hardest thing for a newbie is to survive in that campaign which most of the newbies cannot do that is why they get kicked and banned because they just dont know what to write and where to write.