okay - I would seriously make sure that all bolts, screws, nuts, etc are in place. Check the chain for proper tension. Additionally, check the wheels to make sure they are true (i.e. - they do not wobble back and forth when they are seated in the dropouts properly). Also make sure that all bearings are packed well with grease.

You might want to take this to a local bike shop for this kind of check-up. I would think that most people in this forum would agree with me on this based on your just starting out. Or if you are ambitious, get some tools and dig in! But do some research too. Sites like http://www.sheldonbrown.com/ and http://63xc.com/ (check out http://63xc.com/faq/faq.htm) can be beneficial. You can also snoop around here as we have industry experts and DIYers alike.

As far as pedals, I think these may be a better start for you:
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW

pretty basic set-up. Toe Clips, straps and decent pedals. The only thing you would need to do is match your shoe size the the cage.