If you can design, code, and talk business goals with non-technical people, it is highly unlikely that the W-2 rate paid by your current day job is in the near ballpark of what you'd reasonably expect to achieve by going into consulting at an appreciable fraction of full-time. Quitting your job and hanging your shingle as a consultant-who-solves-business-problems-with-technology will trade a lot of the certainty of your biweekly paychecks for more occasional payments on invoices which would blow your mind.

If you add the constraint "I want to keep my day job", then I'd suggest negotiating with them (and, er, not mentioning that you're unwilling to leave them prior to having that conversation).

There are many people who have, in recent memory, made appreciable fractions of your goal numbers by taking one service offering which they'd be really good at as a technologist -- say, designing iPhone apps or what have you -- and wrapping that service into a teaching product. There are a variety of form factors: book, video course, in-person training event, online webinar, yadda yadda. This does not get less viable if you mix substantial business expertise into the offering or your promotion of it.

If you want to execute on that, I'd start building up a mailing list of people who have given you permission to talk to them about $BROAD_OUTLINE_OF_YOUR_TOPIC post-haste. Virtually no plan for building products gets worse if you have 100, 300, 500, etc people who are willing to hear from you about it.