it doesn't matter whether you do visa run by bus, car or plane. What matters is that you have to cross the border and re-apply from outside of the Thai border. And yes, it better to have Thai hotel booked in advance, to show the you have place to stay. Not sure about money to show, or return ticket, but better be safe and have it just in case.
I also read and was told to have paid ticket showing Im leaving Thailand within 30 days (when I entered first on 30 day holiday visa) but no one in Thai customs anywhere have ever asked me or mentioned anything about it, I just wasted return ticket (although it was very cheap).