You can get a trademark by first determining the service or goods that you want to have it for.
You need to register your trademark with the USPTO, which is done through an online filing.
The TTAB will review your application and assign it either a live or dead status within 9 months of the initial filing date.
If approved, you will be notified and your trademark will be published in the Official Gazette so that other parties can oppose it within 30 days.
So this is how to get a Trademark.