First thing is getting to know how to make a webpage (you can use something like Microsoft Frontpage 2000 or DreamWeaver from
http://www.macromedia.com )
Second thing is learning how to upload the webpage onto a free host. A good program is something like CuteFTP (http://www.cuteftp.com )
Third important thing is doing some sites for practice. You might want to check out the Newbie board at
http://www.netpond.com/webmaster/neoboard
Hope this helps you!