Add Shopping Cart Plugin to wordpress site

I have a 'word press' site that I've recently had set up and I need a shopping cart plugin added to the site. ? I'd like it set up to the point that it is fully functional. At this point there are only two items we are selling: one is a membership subscription to a monthly journal - with an introductory offer for the first 2 months FREE (only $14.95 AUD postage and handling fee) and $49 AUD per month after.? Second is an information pack that we are offering with an option of standard or deluxe. ? We will be adding a number of other products down the track. For all purchasers we'd like to be able to gather their details into a database: ie. name, email, postal address. ? We'd like payment to be by credit card. I will supply all text for the relevant sales pages - no need to include images of the products. ? Check out this website link for a good example of what we'd like: [login to view URL] Thanks!