A 14 stone person (Which equals 196 pounds) Needs a horse that is very sturdy in build and not over 16 hands high. Shorter horses are better able to carry heavier weights than taller horses. The horse should have at least 7 inches of bone below the knee and broad loins. A horse that is fit and weighing about 1200 to 1300 pounds should be able to carry a heavier rider.
It depends on the size of the horse.
The cinch size will vary from horse to horse, measure the horse where the cinch should be and that'll give you a good idea of what size to get.
89.7kilos = 14stone 1.75lbs
94.6kg = 14stone 12.6lbs
14 stone 6lbs in kilograms is 91.6257kg
90kg is 14stone 2.42lbs
Cob or medium
At least half an acre. The size of the paddock will depend on how you intend to keep the horse. If you are going to use a 'drylot' system, then a horse needs a paddock around 100' x 50 to 70' (feet) in size. If the horse will be on limited grazing, then a quarter to a half acre would be better.
It isn't the breed specifically; you need a horse that is the right size for you, and you need a horse that's the right temperament If you are a beginner rider, you need a bombproof horse temperament 0-1). Intermediate should be about a 2-4 temperament. And so on. It also depends what you are using the horse for.
There is no one size for a thoroughbred, you need to find the custom fit for your horse. To find out how to measure your horse for the saddle tree, see the related link.
90kgs is 14stone 2.4lbs
You need to be more specific. What model and what engine size.