You might talk to your webmaster about setting up a streaming server, too. Nothing better for the casual surfer than instant gratification!

But the MAIN thing to do, before you turn your recordings into MP3's is to get them mastered up hot enough. MP3's, at just about ANY bitrate, sound grainy and undefined when working on files that are too low in amplitude and overall SPL.

Some mild compression (on the original .wav), followed by some limiting to raise the overall level to near CD like heights will give the MP3 encoder MUCH more to work on, and add a punch to the sound you won't get on lower levels.

Try comparing your mp3's to commercial ones, and try to get yours at least into the ballpark, volume-wise. Otherwise your potential customers may end up going 'it sounds thin and weak', when all that is wrong is it just isn't mastered hot enough.

Best of luck...