New
#31
I think (and this is what I did with my kid), make a standard account and add them as a child to your account. You give the age and they are such restricted. They can't randomly install or buy stuff then.
You can also monitor them but I didn't so I don't know how well that part works.
There is a tutorial here which I'll add a link to if @Brink doesn't find it first (s/he is normally faster than me)