RedHat will seem pretty different from MS but once you get your sea legs I think you'll like it quite a bit more.
1st) Since you'll be playing around with it quite a bit, you'll want to set up a recovery plan. I'd recommend creating a KickStart file so that you can reinstall without having to redefine all of the install options and software selection. You'll also want to use rsync to make backups to a /backup partition ( or preferably another computer ).
2nd) You want to use Iptables to setup a firewall. These scripts are readily available on the internet. You'll need to startup iptables in your services ( under System Settings ).
3rd) Get your networking going.
4th) startup httpd in your services. You'll then have to configure Apache ( httpd ) for your site.
Your request is pretty broad by at least this may give you a few keywords to search on.
If you'd like some help with these things I can sure help. You can email directly at email@example.com
I'll see them more quickly that way.