All you need to do is buy as much DeepOnion coins as you can and hold them in your DeepOnion wallet. The coins will mature in 24 hours and you will start to stake. The more coins you have, the sooner you will get the staking rewards. However, staking also depends on your weight vs. the network weight and some luck. With staking, if someone else solves the block before you were able to, they will get the coins. You just need to keep your wallet encrypted and open and you will get some coins over time.