Yes! While a trademark cannot register until something has been sold or otherwise provided under the trademark, you can submit an application well before your business has sold anything, or taken on any clients. Filing early has two primary benefits. First, by having your trademark examined early, you can proceed with the peace of mind of knowing that your mark is “free and clear” as far as the federal government is concerned, and that you can move forward to investing in it further. Second, it holds your place in line, as your application will have priority over any applications filed after yours, and any such applications would be suspended while your application is pending. Then, once you begin selling, and your application matures, any later-filed conflicting applications would be refused by the USTPO, as the federal machinery moves to protect your new trademark rights.