Mags:
CMC power mags and Wilson combat mags WORK. I prefer the CMC powermag 8 rounders and have fired a gojillion (tm) rounds with no issues.
Holster:
I like kydex. Ive been very pleased with the CQC serpa holster as it offers some retention, and is easy to draw from. For competition (IDPA / USPSA) I have been very pleased with a Blade tech as it is very adjustable and easy to clean.
Mag pouches:
Again, I like kydex as it can be adjusted and doesn't need to be "broken in" like leather. Blade tech, again, makes excellent mag pouches that are very adjustable, and come in one or two mag set ups.
Maintenance:
I prefer to use a grease on the major moving parts and save the oils for parts that don't see major wear or friction. This works for me, and I have never had any issues resulting from a perceived lack of lube. A heavy day is about 4-500 rounds, and my 1911's haven't had issues. A match day is anywhere from 150-200 ish.
I clean my firearms after every shooting session, so before I shoot, I'm running on "gunk" free lube and there isn't carbon or fouling acting as a lapping agent to "polish" my gun. The maintenance is easier this way since I don't let the nastiness accumulate as some do, and it doesn't take much time to wipe down the gun and re lube it for future use.
Operation:
N00B's may have a tendency to have N00B induced malfunctions that stem from lack of training and or familiarity with the platform. Unlike revolvers and some of the other auto's, the 1911 demands respect from the shooter!
Common 1911 specific shooter induced malfunctions to avoid....
Failure to fire due to poor grip resulting in a failure to deactivate the grip safety. (Fix: Retrain grip. Dry fire)
Failure to fire due to a failure to deactivate the thumb safety. (Fix: Retrain grip, ensure thumb rides on top of safety, dry fire.)
Failure to fire due to ACTIVATION of the thumb safety during a shot string or follow up shot. (Fix: Retrain grip, ensure thumb rides on top of safety, dry fire.)
Those are the 3 biggies I see, all of which can be avoided with good training / dry fire.
You've got to get to the point where you properly operate the firearm without having to think about it. It's not hard, but for those not used to using a safety, it may take some adjustment.
Parts:
Your Baer already has excellent parts, and they SHOULD already be well fitted. The only thing I would recommend is a beveled mag well if you don't already have one. While you don't NEED it, they DO make reloads a bit easier. Wilson combat sells some that fit under the gun and are secured by your side panel screws, which makes it very easy to install.
Other 1911's:
You CAN'T have just ONE!!
You need a full size for carry, and a compact for carry for certain summer time attire....and one for competition....and a spare for competition....and one with a light rail and light for home defense...and one for formal outdoor BBQ's....and one for.....