Earning money with bitcoin is just earning bitcoin since bitcoin is money. Anyways you can try trading if you like big profit and a challenge or you can check services too to see if you can do something for people
Trading is really exciting and challenging as if you are being tested on how well you are at managing it. I wont recommend this for guys that cant go online for quite some time or if you did, be sure to put some limit on how much you are just willing to lose or win. With that it can be controlled and the losing part will be lessen.