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I don't want to be a negativist but if you don't understand these things you should be very wary about opening up your server to the big bad world. Frankly this is entry-level stuff for a server administrator. If you haven't got these things down pat then there's a very good chance you are leaving yourself wide open for all sorts of problems. I strongly recommend that you either invest a huge amount of time learning how servers work or get a professional to help.
I realise you're doing the right thing by asking for help. Just don't run before you can walk. When we decided to start running our own servers we spent two years learning (with a private server) before we launched our first public server. Three years after that we're still learning.
Having your own server is a big responsibility, not just to your own users but to the whole internet community (e.g. making sure you can't be used for open relay etc). You *must* get it right. When you do, it rocks and it's all good. Best of luck!
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