How to replace the headlights?

Hi there. I've been looking at repair procedures for your vehicle and I just want to make sure I am getting the right information. It looks like BMW uses Xenon lamps which have several components and can be dangerous to work on. First off, which series of 328 do you have, sedan, coupe, wagon, convertible? (E90, E91, E92, E93) Or could you possibly provide a VIN?
Also, could you describe the issue in more detail? I would like to help you figure out what needs to be replaced or repaired rather than you spending time removing parts that may not be needed. Thank you.