When you want to admin someone you need to understand that they have an entirely different way they look at things than you. You want someone that not only enforces the rules, but also follows them as well.
I, or anyone else, can't tell you who to admin. Personally it's your opinion on who you see fit to manage your server.
Frankly, I see it like this. If whatever you're hosting is good, people will start coming forward as 'regulars.' These regulars will soon be more knowledgeable than others, and they are ideal choices for promotion to admin. Until you get these people on your server, you've got a couple of options. You can just have friends moderate it, but that depends on who your friends are. I personally don't mind if people think my admins are stuffty, so I admin my friends anyway. Your could also just shut down the server when you leave until these regulars start to separate out. Or you could just leave it up and hope nobody forgets it up. No server will have admins present 100% of the time, so you want your server to be at least enough quality to stand 6 hours or more without an admin present. The best servers are ones that never require a moderator.
Too lazy to keep going on and on lmao so pretty much what trinick said :p