You know what your goods or services are, but describing them accurately and in way that will protect your trademark is not always easy. For starters your description should only include the items which you are currently or intend to use your trademark on. Generally, the best descriptions are brief, using common commercial names, and not vague or broad. Goods/services also have to be classified. The USPTO categorizes applications by putting them into classes (or international classes). Each class included on your application will require a separate filing fee, specimen (sample), and dates when you first used your trademark. Details are extremely important when completing this portion of your trademark application. Mistakes made here can be difficult to correct as once filed the USPTO does not allow material changes to an application. Even minor issues can result in delays and additional fees. Your trademark is important to you so make sure you take the time and care needed to complete it correctly and consider hiring a licensed trademark attorney.
This blog is not legal advice and is not specific to your application. You should always consult an attorney.