I used Revlon Color Silk in 03 Ultra Light Sun Blonde. Basically your just going to dye your hair like normal and if your hair isn't as dark I would suggest going with a blonde shade a bit darker than this one. I waited 30 minutes and I love the results! I am no longer rocking black hair but reddish-brown hair and I love it!
Sorry if this isn't super in-depth but it's straight to the point and very easy to follow.
If you would like to know about another way to achieving lighter hair just let me know in the comments below.