Old Cop, I conceal carry the Shield 40 and do my LEOSA quals with it as well, my second or third outing with it was a LEOSA qual and I breezed through it.
If, after shooting it, you find the grip to be too slick/small etc., you might look into the
Talon Grips or
BooDad's Grips. They stick on and are easily removed if you find you don't like them or need to replace them. I have the BooDad's and really like them. The BooDad's don't cover the back-strap whereas the Talon's do.
Pearce Grips make pinky extensions for the mag if you find your pinky flapping in the wind! I run them on my short mags.
I carry concealed whenever I'm away from the house and for that I have both an IWB holster and an OWB, both made by Safariland/Bianchi.
For IWB I use their
Model 135 Suppression, very comfortable holster, very inconspicuous belt clips and is tuck-able if needed.
For OWB I use their
Model 571 GLS™ SLIM Pro-Fit™ Concealment Holster w/ Micro Paddle. It's a nice, small in size holster and if you don't like the paddle attachment, they have beltloops available for it.
Shop around and you can usually get all of the things I've listed for less than what the MSRP is.
For maintanence, just follow the Cleaning and Maintanence procedure in your Safety and Instruction manual. The cleaning supplies you used for your Glock should be fine for the Shield. Just be sure and lube the seven (7) lubrication points as shown on page 25.
As others have said, get a few more mags, they will make LEOSA quals a lot easier and you won't be holding up the firing line while loading mags!
AND get you a Maglula UpLULA Magazine Loader, your fingers will thank you, your local gun store should have them, and if not, amazon does.
I only have one MAJOR complaint about my Shield and that is...it goes through ammo like poop through a goose so....buy lots of it!!!
Good luck, the Shield is an AWESOME pistol!