I definately agree with opening up the aperture if you are trying to sho full body details. Small apertures are good for profile head shots where you want the background out of focus, but not great for anything with need fore detail. When using a micro lens, you really should try to get a small aperture (big number). With as little as (I believe) 8" between your lens and the subject, the apertures at all levels have small depths of feild (distance in focus before blur). Try setting your camera dial (on the top of your camera) to 'A' (aperture priority) mode and bump the number to at least F/13 for good detailed shots. The camera will automatically set everything else and you will get what you want in focus. A tripod really helps you not have to use the flash too. I know plenty of people who swear by paper towels when flash diffusion is necessary and they are in a cringe. Im pretty sure Gary Fong sells a popup flash diffuser, but its $20 min. I would also agree with the SB-600, but if youre new to DSLRs, I owuldnt jump into the flashed until you get the camera down. You can get good pictures without flash. You just have to work at it. And work at it. And work at it. Photography requires alot of skill, a little luck, and alot of patience.
Good luck! I hope I helped a little.
Mark