Most everything you need for how to do, you can find in this guide.  https://docs.energi.software/en/masternode-guide

Masternode require 1k NRG to get started and you can host up to 100k on one core node/VPS.

You can keep an eye on the reward times for MN here - https://nexus.energi.network/reward-calculator  Currently Average reward time is 36.12 hours.