Hi. I haven't been on a bike in 25 years or so but really want to start (mainly to lose weight). I'm a female - 5'5" - 256 lbs. I am confused by all the bike types and don't know how to start. I live in NYC and will only be riding on pavement and probably not for long distances at first. I am so clueless how to get started and would really appreciate any advice on how to choose the right bike. Also, since I am not sure I can stick to it, I'd rather not spend a grand. Thank you!