I have a contract code for Fi, a working Mainnet node on the Digital Ocean. What should I do next? Please explain in detail because I have little experience.
One way is to build the deploy command using https://fi-code.com/ .
You can build the command by specifying the contract code in fi, the initial storage and balance, and the manager, then pressing "Deploy" button.
Test deployment in Alphanet is strongly recommended before doing this directly to the Mainnet.