At least wide enough for a horse to comfortably turn around, or about ten feet wide.
A Large size
This will vary from horse to horse. To determine blanket size measure from the center of the horses chest to the center of it's tail and that should be the blanket size, if it is a odd number go up one size.
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.
Medium to large depending of hoof size
a great big one
Fine furniture stores will sell entry tables for your walkway. One can also find entry tables at some retailers depending on the locations actual store size.
How much horse power sould a truck have?
Any horse size should be okay for 5'6" person but most ride horses between 15 and 16 hands high.
You should exercise the horse every day, but take it easy at first and then build up a routine. It depends on your horse's health, size, weight, age, etc.
15.2 hands is a great size for everyone. but if you are pursueing a career in Jumping, Cross-country, Or dressage then you may need a horse from 15.2 to 16.0 hands.
The size of a horse all depends on age & breed.
There really is no EXACT size, but they are usually about the size of a normal horse foal.