name change

Wahe Guru Ji Ka Khalsa Wahe Guru Ji Ki Fateh Hi all, I have a question about my issue of my spiritual name and I don't have a group of Gursikhs to talk about this so posting it here in hope of a response of some kind. I've also posted this on another forum so if you go to both you will see...

I have two questions. First when someone decides to follow Sikhism do they have to change their whole name or could they just use kaur or singh as a last or middle name without changing the first? 2nd besides the five K's do unbaptized Sikhs have to wear Punjabi clothes? What about the Khalsa...