Typically a bedroom has to have these features; a window, a closet, and a door. One of the windows cannot be more than 44" from the floor and must allow egress, 3' x 5' for example.
10 by 10
That depends on the house and the master bedroom in question. There is no fixed size, any bedroom can be designated as the "master bedroom" - it is a marketing term, not a specific building code.
The decor and layout of a bedroom.
no
Hire an architect and take the plans to your local building code authorities for review. Then get bids from contractors, unless you think you can do it yourself.
Would seem to be a bit impractical, but I know of no building code that it violates.
It really depends on which state your from. It's not in the building code in Cali or Texas. However, in real estate terms, that bedroom needs a closet to count as a bedroom.
A mess! A children's bedroom is sometimes called a nursery.
an opening to a stadium thru witch people enter and exit
Depending upon where you live, the building code, fire code, and life safety code appropriate for your occupancy (single family dwelling, multi-family, apartment, institution, dormitory, etc) will tell you whether this is a permitted structure. Your municipal building official may be able to help you.
Technically, they can be on a 15 amp breaker when you use 15 amp outlets. There is a difference. Be sure to check your local code (just call the city building department and tell them you have a code question). some cities require the bedroom outlets to be on an arc-fault breaker.
Your answer depends on the location of your lot. Your local municipal building code will dictate your ultimate land-use plan.