The below was completed on a Vultr 1xCPU / 1GB VC2 running Ubuntu 18.04, based on tutorials from Digital Ocean and SSDNodes, alongside various other helpful resources. Instructions do not work on Ubuntu 18.10.
Using this system I currently pay US$5.00 per month to host 2x wordpress sites (1x ecommerce) and 1x static nginx.
If you like the guide, consider signing up to Vultr with my affiliate code. Thanks!
Improvements to the guide (or better explanations) are most appreciated!