Hi + Welcome -
OK.....
This part is normally the main reason for application rejection - Have to be blunt - but anyone applying needs to consider it.
To get a shotgun / firearm license - normally you need to have a clean criminal record, and buy that I mean no violence on the record. Speeding does not count, but they do look at your record.
Next -
Good Reason
The Licensing Officer will consider why you want any Firearm - Shotgun - they like to know you visit a club or have a written permission from a Land Owner to shoot or undertake pest control.
Shotgun is generally less checks, a rifle normally you need to present permission for medical records to be shown.
Best way to apply is
Get permission from a Land Owner to shoot or join a club and go through the training and verification process at the club.
Have good reason to own a firearm.
Remember the Firearm can only be used normally where the License allows, shooting in your back yard with a licensed Firearm is a NO NO.
You normally need a gun safe, and expect a visit from a Firearm officer and show the installation of the safe.
They have to find good reason to reject your application, so as long as you are behaving and have good reason it hopefully will be fine.
Sub 12 rifles to turn upto full FAC I would always recommend a gunsmith do that for you, and sometimes its just better to buy an FAC - it can be difficult with some Sub 12's to turn up.
Cheers
G