This may be a little late but I know somewhat about hair dyeing/bleaching since I've done it hundreds of times. My natural color is black as well. Since your hair is black, the best option is still bleaching as you're trying to go lighter... Dyes are typical meant for people who want to go darker
so it won't really help lighten it to the degree that you want. Your hair will still be damaged regardless if you use dyes or bleach if you haven't used them before but your hair isn't going to be ruined or go bald if you know how to use them properly.
If you're still curious or worried about your hair, it's always best to google & research or ask a friend who's knowledgeable in regards to processing hair dye/bleach before you start your hair journey. If you are still unsure after that or do not want your hair damaged at all, then I would suggest not coloring your hair at all, or just make an appointment with a salon and let the professionals handle it as most of them are experienced and can help you lighten and achieve the color that you are looking for.
But if you're like me and like to do things your way, then just go for it. Here's some information that I wrote if you ever want to color your own hair at home..