Vash, Tanya caught most of the websites. There's also some good books, like Swim, Bike, Run by Wes Hobson.
For a 500ms sprint distance, I wouldn't worry about wetsuit. Unless you can strip like a hooker, the time you save with a wetsuit may be lost in transition trying to get out of it.
Aero bars can easily attached to a road bike. You can find low-end Profile Design on eBay for $20.