As everyone said, instead of signature campaign i think best way to start is to offer some services, or selling stuff. You need to increase your rank/title on the forum if you want to earn some Bitcoin that has a meaning.
Keep an eye on the service section. You can do even small jobs for a few bitcoins. Jobs I did as a Newbie and Jr Member were things like creating accounts on website, search for things on the internet, following ppl on twitter or facebook. There are always opportunities here to earn some Satoshi.