I think you can create the file names in Audacity as you save the files. Anyway you can always change the file names afterwards.
As for bit-rate, I'd explore the options.
For economic or free alternatives to Audacity have a look at the popular download sites -- MajorGeeks, FileHippo, CNET etc.
As I said, the serious professional tools I tried on a friend's machine could probably do all you need BUT they were so complicated to use because designed to do much more than Audacity -- and hilariously expensive.