i have a chin up bar and i can do 10 chin ups but i don't know how to workout?

You're doing it.

The term "workout" can mean many things. A chin-up is simply 1 exercise of many dozens a person can do to condition/change their body. Chin-ups and pull-ups work the arms, back, and chest primarily.

If you have a specific goal for weight loss/gain or fitness or a sport or something you're trying to obtain, then post again telling us what you want to accomplish, and we can suggest types of workouts that may help you reach that goal (along with a healthy diet, of course).

Do push-ups and chin-ups.