Someone could type up 10 pages of instructions and still not cover everything you may need to know. There's a lot of different ways to do this, especially with 2003 server installed. If you aren't familiar with networking, then 2003 server isn't going to do you much good.
I suggest you do some searching of your own first, get your hands dirty, and ask us about your problems along the way. Here's something to get your feet wet: http://www.windowsnetworking.com/articles_tutorials/
What you're going to need is two computers, a hub or switch or router or cross over cable and basic, fundamental understanding of Windows sharing, static IP and DHCP addressing.