I want to contact famous r&b singer because I want to be a famous singer

You contact an agent - not a famous person. Famous people can't really help your singing career - an agent can.

Agree, you need to first have ability, so do you take music lessons, voice lessons. Do you have good ability at reading and writing music.. How often do you preform. Once a week, a couple times a month, You need to get a start on the open mics and at local places where you perform for free.

Then you get an agent who will start finding you paying gigs.

Were do I find an agent?