You can start earning from signature campaigns, if you have higher rank accounts then that will be added advantage for you and you need to join campaign with higher pay outs.
even if someone has higher rank, he can't be able to earn 0.5 bitcoin in a month. unless he has more then one account.
I think the only way to get 0.5 bt in a month is trading (if you know the best time to buy and sell, but it needs years to learn this skill).
Actually, it's possible to get 0.5
BTC in a month only with an account.
If you're Hero Member, join Bit-X signature campaign and make 150 posts/week, you can earn 0.48
BTC/month.
You can get the rest (0.02
BTC) by join avatar campaign, most avatar campaign pay you 0.02
BTC/month.
That is really a nice idea that you gave i will be following your advice so that my earnings would be like that.