Although webmin would be good for you to start (I started with it) - you should eventually begin logging in using SSH and editing in VI.
If you can get SSL working on it - use webmin in SSL mode and it's pretty decent. However - you'll have to keep in mind that it uses a basic http authentication so it can be vulnerable to brute force attacks. Another thing to note is you should not use the default port. When installing webmin - you can change the port it listens on.... change it to something that is not being used by anything else (21, 443, 80, etc...) Something like 2398 - you get the idea.
When I first began remote adminstering my linux server - I loved webmin - swore by it and continue to use it. I have begun editing in VI but there is still something that I choose to do in webmin.
Hope this helps!