I would look around for a different bike. That one is truly a frankenstein.I'm looking just to learn and ride it in a field or on the street I'm about 6foot even around 280 and I'm 18
ALL of these are better options.
http://columbus.craigslist.org/mcy/4628451567.html
http://columbus.craigslist.org/mcy/4634084944.html
http://columbus.craigslist.org/mcy/4620097439.html
http://columbus.craigslist.org/mcy/4613547107.html
They would all let you ride around and get the idea. None of them will be your bike after 2-3 months though... you will want to upgrade. -BIG DAN