On your employment paperwork you use your legal name. Then you can tell people at work the name by which you prefer to be addressed.
I always followed Happy's advice.
And as I introduce myself. First and last name. If its ok people call me _______. Thank you.
To quote Miss America..............."world peace".
To be happy. It sounds simple, but until one walks a few miles in my boots and goes through what I do mentally they won't understand.