Which version of your characters should I download?
That will depend on which engine version you are using. Old versions will work in newer engines, but newer versions won't work in older engines.
Essentially:
Using Ikemen Go - download any version.
Using Ikemen - download Mugen 1.0 or WinMugen versions.
Using Mugen 1.1 - download Mugen 1.0 or WinMugen versions.
Using Mugen 1.0 - download Mugen 1.0 or WinMugen versions.
Using WinMugen - download WinMugen versions.

I'm new at this, where can I find Mugen for download? Where can I download more characters and stages besides yours?
You can find answers to questions such as these over at The Mugen Fighters Guild Forum.

What/when is your next release?
I don't know either.

Can you make a [insert character here]?
No, sorry. Making a character right requires interest on my part, so just taking requests won't do it.

Can I make AI patches for your characters?
Yes, sure. In fact you can make any kind of patch for my characters.

Can I use something from your works?
Yes. You can use anything you want, as long as you don't make any money from it.

If your question isn't answered above, then feel free to send me an email at potsmugen@gmail.com