I'll just recommend starting SMALL. Pick one, and start there. I'm not even sure which one on your list to recommend starting with, just pick one and go with it

I'll just recommend starting SMALL. Pick one, and start there. I'm not even sure which one on your list to recommend starting with, just pick one and go with it. All of those things are widely used and just asking your favorite non-Google search engine for docs/guides/how-tos will give you more good results than you need. Get to know that thing, how to set it up, configure it, keep it running, keep it secure, and how to recover from disasters. Make sure you know how to back it up and start over in the event of failure. So much of what you learn from setting up ONE will carry over to the others.