question about using groff to format ASCII text

[idalton@ferret.phonewave.net]

I need to convert an ASCII text document to dvi, and I need to make the
finished document double spaced with 12-point font. I need to do so
without embedding any formatting directives in the ASCII document.

The man pages and documentation for troff and groff (which I would like
to use) are not very helpful in this respect.

-- Ferret