Hi Daisy,
I was the same age as you when I first started keeping bees .... back in 1973!
From my experience I would only recommend the Modified National Hive. Their are a lot of good books and I'm sure a lot to view on youtube too.
I would recommend you join your local Beekeeping Association, purchase a veil / outfit and attend local apiary meetings to understand first hand what is involved. beekeeing does require lifting and moving heavy honey supers. A National Shallow super full of honey weights around 30lbs and if you used a deep super (brood chamber as I think of them) it will weigh 50lbs.
You havent said where you live but if you attend your local beekeepers meetings the chances are that you'll come into contact with someone who will help set you up.
Beekeeping can be an expensive hobby from the outset but if you can buy second hand equipment you can make substantial savings.
As a starter you'll need:
Clothing: Veil and gloves
Hive: Floor, brood chamber, queen excluder, 2 x shallow supers, quilt and a roof (combs in living areas too of course)
Manipulations equipment: Smoker, Hive tool (and I'd say manipulation cloths)
Extraction equipment: Access to honey extactor, filter / settling tank and uncapping knife
The list very quickly grows and one hive is very seldom enough, for swarm control alone you relly need a second and a neucleus hive (3 or 5 frame hive typically) is very useful.
Hope this helps as a starter.
Pete