We throw showers in the states all the time. The general order of business is introductions (everyone tell who you are and how you know the mom to be) then a few games (do a Google search for baby shower games, you'll get a million options) then food, mom-to-be first, so that once everyone is settled and munching, she's mostly done, and while they have food in front of them they watch her open her gifts.
My very very favorite baby shower item is a diaper cake (nappy cake!) Check out this website:
http://www.diapercakewalk.com
They are the perfect centerpiece, you can use them to play a shower game (have guests guess how many nappies and supplies the cake contains - whoever's closest wins a prize, a small candle or a lotion or something. And when the shower is over, mom to be can take the cake home as your gift to her. Very practical - flowers or paper centerpieces end up in the garbage.
Have a ball!