I don't see any signature campaign that accepts newbie,just take time to make your rank higher to be accepted,higher ranks pays good salary so better to wait until your rank goes high.
Just keep on reading to earn more knowledge about cryptocurrencies it helps you to make contructive post which is a very good preparation to be in the campaign.
Just as i remember when im a Jr.Member i also see less opportunities joining signature campaign,so id rather make my rank high taking chances that i might be accepted once i'll apply.