The average campaign you'll find right now is around 0.01-0.015 BTC a week for full member/senior member.

I would say that the single most deciding factor for increasing your pay is simply try to rank your account up. Stay active and contribute to the community and naturally you will become a veteran member. Keep your post quality high, because not only will you get more pay once you get on higher ranks if you keep your post quality high you won't get rejected from a campaign.

Good luck finding a suitable campaign, and welcome to bitcointalk.