My best friend, the one who lives in San Miguel had to (lovingly) get a wake up call from me awhile back.
He was looking to do something as a small business. Since his Espanol es no bueno beyond his day to day activities, he was concentrating on something he could do for/sell to American/Canadian tourits.
At some point he settled on handmade, high quality candles. As an aside, internally I thought "Yeesh. Candles?" But that's just because my brain always goes off in boringly practical directions. As he talked about it, and what he had seen locally, it did seem there would be a market for it among gringos.
For the next 6 or 8 months, he researched different waxes, scents, containers. On a visit he made back to his home state, he even got some pointers from an old neighbor, who ran this type of business online (at a decent profit) out of her home. He watched her making them, how she marketed, etc. Internet sales though, aren't big in Mexico. At least not at this time. There's a lack of trust (I wouldn't say undeserved) in getting the product you buy, plus it's very much a cash society.
Anyway, he wanted to keep it local. In all those months he did a lot of research, and also felt out the market on where he could sell his product, sources of materials, feeling out an appropriate name, and so much more.
In fact, he did everything....except make any candles. When we talked I asked if he should make a few and sell some at the ubiquitous weekend festivals that attracted a lot of tourists. That started him down the road of outdoor kiosks, tents, tables, and on and on.
Finally I said "C! Look at that guy over on Sterling Dickenson who sells paella every day out of the trunk of his car! He's been doing that for years (he's got a lot of customers) and all he has is a spot on a side street, a cooler full of product, and a sign he writes out on posterboard where he crosses out selections as he sells out. You can start off selling your stuff off the tailgate of your Durango over at the Parroquia. This is San Miguel, not Silicon Valley. Faced with the reality of actually Doing something, within a week he never mentioned candles again. Fortunately, he got into something he already knows a lot about, and is a lot more lucrative.