Newbie needs help with garden just acquired

I'd be grateful if someone could identify from these pictures I've just taken of
the shrub and its leaf.
It's a pleasant but uneveventful looking orb of about 5 feet in diameter. I'd
like to cut it back into a smaller sphere but don't know what is acceptable (or
when it should be done). Perhaps it produces flowers and I should wait?

help most appreciated.

http://www.geocities.com/quooriosity/whatsthis

http://www.geocities.com/quooriosity/leaf