I'm newbie too when I joined my first signature campaign. And I accepted.
Just sharing from my experience.
1. Find Signature Campaign which accept Newbie member. Not much. You don't need see the payment/rate per post. --> I just see it as training or practice
2. Look the slot, is it already full or not for newbie member.
2a. if full, find another Signature campaign which accept newbie member
2b. If still an empty slot, try to aply.
3. Read the instruction carefully.
4. Do all the requirement or follow the instruction correctly.
5. After you follow all the instruction correctly, apply your account.
6. Wait until a week. If you are not accepted yet, send a message to campaign maintainer --> ask is your account accept to that Signature Campaign or not.
6a. if you are accepted, you are ready to post and earn some BTC. While you upgrade your account level, you can earn some BTC
6b. If you are not accepted, just recheck the requirement.
just sharing