I apologize in advance if this is a really Noob question but I'm going to change the oil myslef on the bike tommorow and was wondering if anyone could give me some pointers before I fuck something up.

I have all the oil and the filter but I was wondering where I could get a new oil drain plug washer or if I even need to change it?

Also a filter wrench, I saw one at Wal-Mart that looked pretty small, is it a special kind of wrench to use only?

Thanks for any input, this is the first time working on the bike, even if it is only changing the oil, But ya gotta start somewhere right?