Home brewing (which can produce excellent beer) is entirely different to being the owner/brewer of a microbrewery. However, the ability to come up with new brews is a 'plus'
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It is an excellent idea to go on a course - I'd recommend the one run by Brewlab, though there are many others.
Like anything else, it is a good idea if it works. Setting up costs can be expensive; but many (most) microbreweries are set up using 2nd hand equipment. Nothing wrong with that, 'cos it is virtually all stainless steel. New casks are about £40 each, but 2nd hand from Bass (or similar) are usually available.
*** Very importantly any brewery needs a steady supply of 'good' (usually hard) water.
*** Another point to be consider is how to deal with 'waste'.
Producing a good brew is relatively easy; what is hard to get right is consistency. Hardest of all, is selling the stuff. He would have to visit 100s of pubs (freehouses are best, but some tenancies will buy) and travel many 100s of miles. Forget Weatherspoons; they buy heavily discounted beer which is close to the sell buy date. Tell him to join Camra and to visit the nearest freehouses - they would be the first place I'd look for customers.
He would have to be highly organised; he would need to arrange his 'drops' & 'pickups' so that his fuel expenses are minimised. Many small breweries use 'beer agencies' which sell beer in far-flung areas, but they obviously require their cut. Beer festivals are also a good place to promote new beers.
As others have mentioned, a good name is a must; a couple of years ago, a small concern opened called the Offa's Dyke Brewery. What a great name !
I've known many independent brewers over the last 30 years; for some, our pub was their very first outlet. Some of the more successful ones now have bottling plants. A friend owns a micro brewery, he organises trips around his brewery for £7 a time; for that, he lays on a ploughman's lunch and as much beer as you can drink. The visits are very popular and excellent publicity.
If your friend is ever up in North Shropshire, I could easily arrange a guided trip around a small independent brewery. Sadly, I gave away the barrels that we owned, though I do have a couple of stills & pin - to be used when all the Cyclechat fraternity come for a bike trip out. Actually, a pin wouldn't be enough; I'd probably require a couple of firkins. I've got a few boxes of (new & unused) pint glasses that I'd happily give him - he's going to need something from which he'll sample the beer.
Any queries - give me a shout !