Ebook Download Software?

Gordon, Jim and the gang,

I have a written manual I would like to sell via a simple website. My initial plan is to offer the manual as an electronic, downloadable ebook. My questions are these.

What's the best font and size to use when writing the manual? What type of software is needed to download the ebook? I'm looking at Jim Straw's "Mailorder Business" manual to pattern my ebook after.

Any input will be appreciated. Also Gordon, thanks for putting the SQ1 Workshops back up. I've always found them useful and worth looking at over and over.

Mitch