BUY yourself a nice pair of black shoes. Tennies and suits just don't go, even if you are just wearing your suit once hell freezes over. Colognes are nice and many women do like a guy who smells nice, but don't put so much on that you end up leaving a scented trail behind you for miles. Use a cologne sparingly. If you end up going out more than a few times, she'll likely let you know what cologne, if any, she likes or doesn't like.
Nothing makes the worse impression than unpressed clothing.
Take a few minutes to get a good iron that has very good steaming action and your wrinkle worries should be gone. TUCK your shirt in properly. This was one of the newer lessons I had to learn when a past girlfriend chided me for not tucking my tux shirt in properly. The best way is to put your shirt on first and then put your pants on. I know that we often make fun of women for having so many accessories, but men should have a few items as well.