My Youtube Life & Selling Food in Japan (Laundry Vlog)

Laundry vlogs are for listening to as you do laundry. Today I answer the email of the most persistent viewer.
If you don't mind me asking, and I hope it hasn't been asked a million times already, but how viable would it be to sell food in Japan? Something like a small corner/street stand, or even selling in the neighborhood you live in or nearby town? Are there any licenses or permissions required to sell as a small time street/market vendor? In the USA there generally is, but in many neighborhoods there will be a household or two selling cakes or frozen drinks or whatnot essentially under the table, and it's not really illegal or punishable as far as I know. Is the same true in Japanese neighborhoods/communities?
Some background on this entire idea: I really enjoy growing fruits and vegetables, and am familiar with climate controlled indoor gardens (I have heard land is extremely expensive in Japan, so indoors would be a very doable method) and have even grown a few square watermelons before. I also enjoy baking, and make a number of different cakes/custards. (I make a ridiculous cheesecake) Would growing/baking these things with the intent to sell be easy enough to do? I can make them fairly lavish and with natural/real ingredients. Would I be able to sustain myself if I had a part time job while doing this? (not sure how hard it is to get a full time job there) After awhile would it be sustainable without a job at all? (assuming visa was covered some other way) I prefer to live with as few material possessions as possible, and don't really go out to eat very often, or watch television, so my cost of living might not be quite as high as some others. Oh, I can also make candy bars from scratch, as well as make my own home made wines but I'm sure there are all kinds of laws and restrictions with the latter. The reason I am even asking about these specific foods is because I have seen many examples of fruits and certain rich/decadent baked goods selling for much higher prices in Japan than they do in the USA.
Also, I wanted to say that I really enjoy your videos. They are both entertaining and educational. Keep up the good work!

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