One of the most lucrative professions to go into today is that of karate instruction. Good karate school instructors can gross over one million a year. Here's what you do.
First, you need to go to karate school yourself for about a year. That will cost you around $1,000 for twice a week sessions. It is money well spent. You don't need to emerge as a black belt. All you need to know is what is taught the first year of Karate. If you can attain yellow belt level, that will be sufficient.
Now, place advertisements in some local papers. Have flyers made and posted around town. maybe splurge for one or two radio spots. Limit enrollment in your "beginners karate" class to about ten students. Twice a week, for one hour, teach your students what you yourself learned. With just 2 hours each week of work, you have now made $9,000. ($1,000 tuition for each of ten students, less the $1,000 you paid).
The next step is to form additional classes. Every time you recruit ten new students, you have another class. If you have enough for twenty classes, then you can work a regular forty hour week. However, unlike most guys with forty hour a week jobs, you will be making $200,000 a year (less the $1,000 you paid).
Finally, after the first year, hire your best students as instructors, and you now have a "karate school." Each instructor can gross $200,000. Pay your young instructors no more than $20,000 salaries. The rest of the money is yours. If you have ten instructors, your profit will be $1,800,000. And the best part is, at this point you no longer have to work.