Hi there

Copyediting in the wikipedia is stated as:

Copy editing (also copy-editing and copyediting) is the work that an editor does to improve the formatting, style, and accuracy of a manuscript.[1][2] Copy (as a noun) refers to written or typewritten text for typesetting, printing, or publication. Copy editing is done prior to the work of proofreaders, who handle documents before final publication.

How successful you want to be is up to you. You have to work at it to be successful. Which means networking, research, marketing, advertising etc. I suggest contacting writers and see if they need assistance with there business. That could be one of your target markets. I personally wouldn't just offer editing as a service but it cold be your specilty. Not sure if copy-editing requires any kind of degree or diploma or not but if it does and you do not have it then there may be a problem. If that is the case then you can offer editing services only.

best of luck and believe in the law of attraction. If you believe you will succeed then success is on the way!