It is important to file your patent application(s) sooner rather than later as the United States is now on a first-inventor-to-file system. So our general advice is to go ahead and file your own provisional utility application as soon as possible, but don't rely on it. Show the end result to your patent professional who can then evaluate if it is adequate for what a provisional patent application is supposed to do, and then suggest next steps if there is some deficiency.
We also do not recommend filing your own design patent unless your design patent drawings are professionally created and reviewed by a former design patent examiner (see "Pre-file Review of Drawings and Spec" service at our sister organization, Design Patent Rescue).
Also, we do not recommend that you file your own non-provisional utility patent application since writing claims can be difficult for the novice, and the scope of your protection with such a patent depends on how well the claims are written. Naturally, if you need someone to file your patent application for you, we will be happy to assist.