Welcome aboard! Looks like you already have the help you need. Don't buy your bobbins off Ebay. Go to
http://www.sew-classic.com/ instead. They have a very good reputation here and sell high quality bobbins. It does make a difference. In addition use only sewing machine oil or Tri-Flow oil on your machine. Other oils can gum it up over time. It's also worth mentioning your machine uses low shank feet and attachments, it also uses standard sewing machine needles. I researched my first machine quite a while before I figured that out. I think which feet a machine uses is one of those things that's so basic it doesn't get mentioned much.
Don't worry, the maintenance isn't hard and after the first thorough cleaning and oiling only takes a couple minutes. I do believe doing it yourself is best, you'll get more familiar with your machine that way. I don't own one yet but model 15s are pretty highly regarded here. I expect you'll enjoy using it.
Rodney