If you have more than 1200 clams then you can run a node and stake clams by yourself, You can do it with fewer clams too, but 1200 is the right amount to get 1clam/day. Another option is to deposit the clams in just-dice.com then invest and you will get part of the stake, but this way has a risk because you are part of the house, so if the house lose you could lose part of your investment.