You gotta buy a shirt with French cuffs (thats what the edge of the sleeves are called - see the picture below).
I used to wear them all the time (I love that look). To me, its the little things (like a nice pair of cufflinks) that top off the perfect attire.
You don't have to spend a bundle to get a decent shirt. You can find some good ones for about $35. If you're just starting out building up a wardrobe I suggest you get a white shirt (it'll go with a variety of styles) first.
French cuffs:
