On the application to receive a FFL it asks basically the same questions as asked on a 4473. And if you can be denied by your answers on a 4473 you are probably going to be denied a FFL.

The only thing the Sheriff has to do with the process is that is the office you apply to get the state firearms license. And again you fill out a form a that asked basically the same questions as the form for the FFL.

The interview is not a big deal, they typically use it for clarification to answers on the form and to give you hints and tips on how to make sure you stay in compliance. They are also there to take a look at the premises that you listed on the application to insure it is how you described it.

Here is the best place to get your answers to the process of getting a FFL:

http://www.atf.gov/firearms/how-to/become-an-ffl.html