Welcome to Susan's, Gates.
You don't have to do everything at once. I came out to my friends before my family, but my situation may be different. You want to build your base of support the best you can before you tackle the hard ones (if possible).
BTW, I changed from the diminutive of my birth name to a more adult version when I was 13. Forty years later my mother still called me by the diminutive (when she didn't call me by my brother's name

).
Welcome and good luck.

- Kate