Ever so often something is so easy to draft I can add it here. Generally drafting is a long process which needs most of all experience sewing. If you are a beginner then drafting really is not where you should start. Without understanding how something needs to go together, its impossible to create a really well fitting pattern. Sometimes though when the shapes are very easy you can.
For all you advanced ladies I have added a few videos here, not done by myself but they are really good and as I get asked so many times to teach it I will at least show you where to start.