Invest in a trusted site invest your bitcoins there and then it will earned a capital even you do nothing while investing you can do mining or gambling to have time to earn another that way you can bitcoin in a great ways and multi tasking way.
I think it is better to manage your own money that let others manage it through investment, anyway that depends on your decision but with small capital, it is not good for investment. What my recommendation with small capital is to learn how to use it in trading, there is a bigger chance you'll grow it because the market is very surprising and pump will happen anytime.