Binding a quilt is not as hard as it seems.
This tutorial is great- very easy to understand, and it will help you bind your quilt neatly.
These directions are for cross grain double fold binding. This seems to be the most common form of binding for quilters. This is my preferred method because it the least wasteful. In my opinion, it holds up just as well as binding cut on the bias and is a little easier to work with because it does not stretch as much.
Do you know how much fabric you need? See How to Bind a Quilt, part 1.