U.S. trademark lawyer

Hi my name is Abdulkadir Guuled, I reside in Ottawa, Ontario, Canada. I am interested in filing a Trademark with USPTO. After attempting to register for one at USPTO website: "Foreign-domiciled owners/holders must have a U.S.-licensed attorney represent them before the USPTO in any application- or registration-related filing" Please forward me the details about your process, cost. My goal is to sell pet products on Amazon. I have the name of trademark I would like and can provide you all necessary application information. Amazon has option, where I can start using the trademark once the process has started, detailed as "pending", so I am not pressured on timeline.