Nothing has been said yet about 3 levels of masternodes, with x5 reward for a first year. Meanwhile masternodes work since the mainnet launch and this x5 bonus is a nice opportunity for early adopters .
It's easy to install the node, there is a good step- by- step instruction  at  the project's Github. Also there is a detailed video guide, the link could be found in the official Helios Discord. Except the video there is a friendly team, those are ready to answer any other question you might have.