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The main objective of a trademark search is to locate if someone has previously trademarked or registered your intended mark. As early as this stage you will need a trademark attorney to either assist you in your quest or perform the trademark browse your behalf.

No trademark will probably be registered twice

The US Patent and Trademark Office is clear about this, there isn't any chance for one to register a trademark that has been previously registered or appears in their record. After you have filed the job the USPTO will conduct a trademark search as part of their investigation, face it, they're not doing it in your favor, they may be simply looking for something to disqualify the job. So, to spare you against the trouble and saving time and money (USPTO will not refund your fee, which means you should be sure with the job), it is best that you do your trademark search before submitting your application. Your trademark attorney will be the best person to perform research to suit your needs.

You also can perform Online Trademark Search, check out the website for more information.

Resource: trademark status