A small, light weight, hammerless revolver like the S&W 642 with 38+p (or 38's if +p recoil is too much although it wouldn't take long to get used to them enough to go to +P), a Mika pocket holster, and a Crimson Trace grip is just about the perfect first carry gun. It's a combination that you will keep forever because it will always have some role to fill in your CCW arsenal. As you try different semi-autos in different calibers the little snubbie will be happy to ride along as a backup gun. It will also be happy to step back into the primary role when you are making a quick run to the store at 11:00 or taking the dog out for a walk or when it's 110 outside. It will also be happy to serve as a car gun. It's a great weapon that will provide a lifetime of service with minimal care.
Load up with some snap caps and use the laser for trigger and target acquisition practice at home. For target acquisition practice point the gun at the target quickly without activating the laser. Use front sight or no sights. Activate the laser to confirm point of aim. For trigger practice squeeze the trigger while the dot remains on target. The skills this will help build will be transferable to any other handgun.