Do I need a copyright?

Placing a notice of copyright on original works, though no longer required by law, is highly recommended as it serves as a notice to the public that the work is protected by copyright. Further, having a prominent copyright notice on a work will foreclose copyright infringement defendants from raising a defense of innocent infringement, ie. arguing that they did not realize the work was protected by copyright.Proper form of copyright notice is as follows:

The symbol ©;
The year of first publication; and
The name of the owner of the copyright.

For example:
© 2016 Sarah Conley Odenkirk 
It is also advisable to include a statement of “All rights reserved.” at the end of the notice.