I have dreams of being rich with bitcoin after seeing some of my friends success of bitcoin. but I am confused, what should I do without capital
If you don't have a capital, then don't expect too much that you will be rich in bitcoin. It's like you will work as a freelancer or you may want to be a trader after getting paid for some jobs that you've got. First you have to look first a job that suits your skills and knowledge and you'll get paid with bitcoin. There's no other way for it.