Yeah, we go to a big-ish farmers market just outside Ottawa every Saturday morning. It's good there but my wife (and 15% me) has spent 11 years now building a reputation, knowledge and a name for herself. We also have around 40 weekly customers who pickup a basket on the farm and we do "grab bags" every sunday (or monday) where people can order a one-off basket, usually priced around $35. We're also growing 18,000 garlic bulbs which are all harvested now and some are drying, getting braided, cleaned, some already sold. Life is pretty good here but it is lots of work. I'm a contractor busy building bathrooms right now and my wife is working way too much (often 12 hours/daily) and its not like its all sitting at a desk
My best advice would be to grow nice simple/normal stuff like tomatoes, cucumber, lettuce mix, micro greens, carrots, beets, kale, herbs and that kind of stuff. Stuff that sells. I hate to say it, but at the end of the day, a crop has to be able to make $ in order for us to want to produce it. There is just too little time to grow a bunch of "fun" stuff that only appeals to 5% of your customer base. I hope that sounds reasonable and not too cynical. Facebook is a great marketing tool and see if you can get in with a farmers market local to you. We tried having an unmanned road side stand years ago and it sucked. Dont to that, lol.
That aside, thats some crazy good pricing on perlite/purmice! I just found a 9L bag tonight at Canadian Tire for $10. It's all priced around $1/litre if you can find it.
EDIT: Forgot to mention - the greenhouse is around $8k and maybe around $2k for the sand pad it sits on, pressure treated 2x6" foundation, plastic etc. It's a double walled system with a fan that continuously blows air to fill the gap between the layers for insulation. Still itwould go through a bbq-tank of propane pr night if it went down to -5c or a bit lower. Still way worth it though. I can tell you by the end of the year, but it's probably producing $300-$500 pr week in tomatoes alone in the growing season which is fairly long here (relatively, its fucking canada lol). I LOVE the greenhouse.