If you are talking about altcoins that have masternode, then it depends largely on which one you have in mind. Mostly you will have to lock some coins away in order to run masternode. Here is some good list regarding many coins, how much does it costs in their coins in order for you to even start, prices per each and other useful information, I advise you to check it out: https://docs.google.com/spreadsheets/d/1D-VhuSSt7fMrSP22WdREqOuJIDu4iZV7vrx41jBNnqQ/edit#gid=708288622
Why have you bought VPS, if you are not sure what it takes to even start with masternodes, specially if you haven't checked out the hardware specs and all that?