Do the oil change not long after a ride; warm oil flows better and so you get more of the crap out. Mind you don't burn yourself.
You may also want to replace the drain plug crush washer; some people do, others reuse the old one; they're not expensive. Takes 14mm.
Look in the tech section for oil and filter types.
The biggest part of the job is what to do with the old oil. If you're not-so-green, you can pour it down a grid. A local garage will probably charge you to dispose of it (they themselves get charged to have it taken away) or, do what I do and take it to the tip (for which there's no charge in the UK).
(I dunno what you lot call a tip: waste management facility?)
