Join to a signature campaign can be a good way of earning btc on the forum. However, since you are a newbie it would take about a month for you to actually start earning money from it, cause most signature campaigns only accept higher ranked members and probably not newbies. So you have to increase your rank first.
I think I saw some signature campaign which accepted newbie and jr member like you. I just do not know if I am allowed to state the sig campaign sites here for newbie and jr member. Just check the thread for newbie. I saw it there. But of course they will pay you a little bit lower since your account is only newbie but whether small or big it is still a nice way to earn and add to your wallet.