Great! The first step would be to set up your DappNode. You can follow the instructions on their website to get started. Once that is done, you'll need to install the Ethereum 2.0 client on your DappNode. This will allow you to stake your ETH.
Once you have the client installed, you'll then need to transfer your ETH to the Ethereum 2.0 deposit contract. This requires a bit of technical know-how, so make sure to follow the instructions carefully.
Finally, you can start staking your ETH and earn rewards for helping to secure the Ethereum network. Good luck!