There are many different kinds of gamefowl and landraces out there. I've had a variety of both here and I definitely recommend you plan your first flock out seriously. It's much easier to make a good start than to recover from a bad start
In regards to landraces they're typically adapted to particular regions, such as Icelandic chickens being obviously adapted to Iceland, Egyptian Fayoumi being adapted to the Fayoum oasis in Egypt, and Sumatra being adapted to the tropical island they're named after in southeast Asia
I've personally had both Egyptian Fayoumi and Sumatra here, and you couldn't pay me money to take in more Fayoumi. They're
absolute monsters and impossible to work with. Sumatra on the other hand have sweet, intelligent females and human aggressive males. I suspect landraces are all extremely different from one another temperamentally
Gamefowl on the other hand come in two main types, the velociraptor shaped ones (Malayoid) and the normal bird shaped ones (Bankivoid). It's theorized that the Malayoid types developed in landrace fashion on isolated tropical islands that lacked mid-size predators, so they did great in island grasslands with tigers running around because the small meal isn't worth losing an eye
Speaking from experience I've only ever had two gamefowl breeds here, American Game and Asil, and they're both extremely noble in character. Perfect survival chickens for my homestead. I've heard that some gamefowl can be human aggressive such as the Malay but I can't say so personally. The two game breeds I have here are the kindest (and toughest) of all my chickens
I think the fastest path would be a game rooster and hen pair. The females are fantastic mothers that put all other types of chickens to shame. If you went with a rooster alone you'd either have a production hen raising half-games (not ideal), or you'd have to brood them yourself. With a game hen though you'd have a devoted mother that will do all the work for you and will fight predators off ferociously
This is a good article about someone in the US creating a landrace for his homestead. It's pretty simple really