My local university has a non-profit for small businesses and I've been going to some classes there.
:thumbup:
That was going to be my first, and really only bit of advice:
speak directly with experienced professionals in your area. Laws and regulations and all that stuff can vary widely from state-to-state and even city-to-city.
For instance, where I'm at an LLC didn't really add up. Since it's just me, no employees other than some help from a family member (my wife stitches my sheaths), local regulations allow me to work as a "self-employed/home business" with nothing more than a city and state tax license. But I can't have a retail store on the property - that's different zoning, licensing, etc. More importantly, my entire operation has to remain under the same roof as my house. No outbuildings. An attached garage counts for that here; putting my shop in a
detached garage would disqualify me and bring up a whole other set of regulations.
My wife has pretty good health coverage so I'm covered there. My homeowner's insurance covers my tools and all the normal liability, since it's just me and I conform to the "home business" regs. BUT! I do not have employees, or allow visitors/shop tours during work hours, and perhaps most of all,
I don't forge. That would open yet another whole can of worms.
Insurance agents are very familiar with guys having a grinder or some saws and routers for woodworking or stuff to putter around on their weekend hotrod, or even an (electric) welder... that kinda stuff will not surprise them.
But I'll hazard a guess that a forge in your shop would surely raise some eyebrows, and probably your rates. (they have this weird thing about open flames

) So insurance is going to depend on a number of factors, too.
As for getting sued over personal injury... look man, no
sane lawyer on earth is gonna take a case against an independent craftsman because his client cut his finger off with the craftsman's knife. I'm not saying it couldn't happen, but A) people know what knives are, for pete's sake, and B) the numbers just aren't there. Unless you make some really cheap junk that simply falls apart and gets someone hurt, I don't see it being much of an issue.
Trademark? Don't be mucking about with known trademarks when it comes to logos and advertising and blatant copies of other peoples' knives, obviously. But it turns out, other than certain locking mechanisms, there's not really a whole lot you
can trademark on a knife. (Except for a Talon Hole... you can trademark that, apparently. I doubt that would really stand up in court, but we'll never know until someone hires the lawyers to argue it. )
Now copyright... that's important. Never use an image or soundfile you didn't create yourself, or hire someone to create, or pay royalties on, in any promotional stuff, website, etc.
Anyway, that's why I say talk to professionals in your area.... this stuff can get complicated quick. It doesn't have to be as complicated as running a multi-million-dollar machine shop with 30 people on the payroll, but you'll sleep better at night knowing you're legal, and your behind is reasonably well covered.