[Hysho]

use it to host a rat or to mine crypto

This is most likely the path I'm going down.
I'm going to use it to host a RAT, Image Hosting and a VPN.

The thing is, What RAT should I host? and Know any recommendations for Image Hosting Tutorials?

You can use paid / cracked / free RAT, but I recommend you using a good crypter. Also, you need to port forwarding and If I were you, I would use a VPN that allows that such as NVPN.

Specific Recommendations
I plan on using BYOB as a RAT
I don't believe it will be hard to spread it but I'm looking for good crypters if you got other RAT recommendations too