encrypting a remote VPS, and letting it boot without entering a password

I Have rented a VPS and I want to encrypt it's data, at least on the /home directory, because I don't want the owners of the VPS to have a look at the content of my data. But the server **already has data** on it. my questions are: 1- /home isn't a separate partition, neither /boot .. in this case can I encrypt it? 2- How would the server boot, it's running headless, and I don't have access to it. 3- I have a trusted server on my home, can I use it somehow to hold the password so the VPS server would access it and get the password hash and boot? Thanks a lot, have a nice day.