Bitcointalk froum rank plays a major role in earning from signature campaign as a newbie your weekly stakes would be the least as compare to other higher rank members and I would suggest you always try to do 4-5 week signature campaign. 50$ worth of coins in 2-3 months is not a fair reward but I would advice you do not sell it instantly you must hold for sometime might be it can rise and pays you much more reward for your little more patience. Inspite of this Its better you focus on participating in translation campaign, Article campaign & youtube campaign that pays you more as a newbie as compare to signature campaign.