And the best way to inform I've ever heard about is that when the officer asks for your ID, quietly hand him that and your permit at the same time. Don't say gun.
In some 'must inform' states, that may not work. As simply handing the LEO your ccl is not an admission of carrying a ccw at that present time. You must verbally tell the officer if you are carrying.
In Ohio(must inform state), when handing the LEO your drivers lic. along with your ccl. you must inform at that time if you are carrying.
Failing to verbally inform at the onset of the stop may get you a felony.