Best way to get started would either to know someone who sews that can give you nudges in the right direction during your project, or to go into the local fabric store and ask the ladies there for advice.
I recommend starting with a Simplicity Sew Easy pattern, usually simple tunics and draw stringpants. They aren't always pretty, but they can be great clothes to lounge in! Buy some inexpensive fabric so if you mess up and have to start over, it's not a tragedy. I started with some simple cotton gym shorts (though I never finished them, so I don't really count that. )
Eacy pattern you buy comes with sheets of directions. Best thing to do at first is to read through the ones applicable to your desired project (sometimes patterns come with options) to familarize yourself with the pattern and to get any confusion or questions out of the way.