Federal trademark registration is both more expensive and more complicated than copyright registration. The registration process begins with an application and filing fee of $225 to $275 (sometimes a bit more). Once you apply, the US Patent and Trademark Office (USPTO) will assign an attorney to examine your application to determine if it meets the requirements of registration, or, if it should be rejected for one or more reasons.
Sometimes, applications are rejected because there is an already registered mark that causes conflict with the applied for mark. Applications are sometimes rejected because the applied for marks are descriptive. Some rejections are quite technical, involving the specimens provided in the initial application. If you are fortunate, your application will not be rejected and will move quickly towards registration.
If the USPTO finds a reason to reject the application, it will issue an Office Action explaining the rejection(s) and you will have six months to respond. After response, if you have not remedied all rejections, the USPTO will issue a Final Office Action. If your response to the Final Office Action is inadequate to obviate the rejections, than you will have to begin the application process again or file an appeal.