http://www.physics.ubc.ca/mbelab/com...ux-intro/html/
http://www.freesoftwaremagazine.com/...and_line_intro

You're really starting from scratch here, so I would recommend reading up a bit before you try to do anything. It's easy to screw stuff up if you just bumble around and type things in without knowing what you're typing.

There are a lot of other threads on the subject with a lot of useful info. Searching will be a worthwhile investment of your time.