A trademark is any word, name, symbol, sound, or odor that is used to identify and distinquish the goods or services of one seller from another seller. A trademark is also used to indicate a source of goods or services, or as a source indicator.
There are two different trademark systems. Each state has a registry and the Federal government has a registry. Which one you choose depends upon how you are using the mark. In order for you to successfully register with the Federal system, you must be using the mark on goods or services and selling or advertising across state or federal lines. For the state system, you should be using the mark in the state of application. A state registration provides protection within the state, and a federal registration provides protection in all 50 states, Puerto Rico & US Virgin Islands regardless if you have actually sold or advertised in these areas.
You can and should put the “TM” on your mark. This indicates common law rights in the mark. Common law rights only provide the opportunity to file suit in the areas where you have used or advertise the mark on the goods or services that you are selling.