There is no need to register. However, if your trademark is registered with the Trade Marks Registry, it will be beneficial in the event of a future dispute (part of the Intellectual Property Office). Your mark must meet the following criteria: it must be "distinctive in regard to the products for which registration is sought" and "not misleading or contradictory to the law or morals" in order to be registered. You will need to make sure that no one else has previously registered the same mark or anything extremely similar to it before submitting your application. The fee of registration (which is renewed every 10 years) is $200 for one class of products and an additional £50 for each additional class that is requested. You should also budget for some additional expenses, such as search and consultation services. All of these services are available for purchase on the GOV.USA website. You may wish to outsource this task to a trademark agency, which may also be a patent agent, in order to avoid any confusion. Find a member of the Chartered Institute of Trade Mark Attorneys or the Chartered Institute of Patent Attorneys who are sufficiently qualified in their field.