I would suggest that you should learn first the rules and regulations here in bitcointalk forum before finding and joining in a signature campaign. Especially, be careful not to receive a negative trust, because having one decreases your options. Since most bounties doesn't accept members with negative trust. Second, try to rank up at least at Jr. Member. Commonly, the lowest rank that campaigns accept is of Jr. Member. So, I think you should focus on that first.
I would recommend that you use the site search with bounty programs https:/bountylord.com. But you will find it difficult to find the program signature for newbies. Better find yourself a Twitter or another bounty company.
Thank you for this website. I am getting tired of looking at tons of threads in the Services board. This helps a lot!