Some random thoughts in no particular order
Solid, reliable in the extreme and very shootable - oh yes, and cheap. You've gotta love it.
Accuracy is a function of the shooter, not the gun - so I might do better (or worse) than someone else with a different gun, basically though the gun will outshoot you.
The trigger on the M&P (and the Glock) is quite unforgiving of poor technique, expect to see your groups go low and left before you start to develop the skills you need to have to get these guns to work for you. Sight alignment and trigger control are key.
Use the money you've saved by buying the range kit to get ammo and training.
Regarding training - the single best use of money when it comes to shooting isn't gun bits, pistolsmithing, or even a metric buttload of ammo, the best use of money is professional training from an expert. It's also a ton of fun.
The trigger will smooth out with use - these guns are meant to be used - hard, don't be afraid to get it dirty. (as an aside; at a recent course I was at, when we had to start the drill with the pistol on the ground facing the target, the funniest thing happened - all the Glock and M&P guys basically dropped the gun down and kicked the muzzle square to the target, all of the 1911 and other shooters bent down and placed theirs carefully on the ground)
Last but not least - when you start shooting, don't stand at 25 yards and assume you're going to hit a 10 inch bullseye, there are 2 things wrong with this; firstly you're too far away and secondly your point of aim is too big. Start as close as you can (3-5 yards is ideal) and use a smaller aiming point on your target (a standard 3x5 filing/recipe card works great). This is because every small mistake is magnified by your distance from the target, and it's psychologically advantageous to aim at a small target - hence the expression "aim small, miss small"
I'm not sure how much of the above applies to the OP, but it's what I've picked up in the last 30 or so years of handgun shooting and 42,000+ rounds of M&P shooting.