Brian-
My advice: DO NOT WASTE YOUR MONEY ON CHEAP-O HOLSTERS. $20 here, and $25 there, and maybe a $15 over yonder on some poor quality holsters, and you've spent $60 and don't have a suitable holster yet. It's kind of scary, but if you drop some cash on a quality holster, seldom will you look back with regret. A quality leather holster will take some time to break in, so I would vote for wearing a quality holster around the house and breaking it in rather than a cheap-o holster that will never feel quite right. My opinion only.
I echo Rick458's idea about the Milt Sparks Versa Max II. I'm 5-11, 180 lbs, carry a full size government model, and absolutely love the VM II. To each his own, but it was money well spent. I only have two concealed carry holsters, but they were both made by Tony & crew at Milt Sparks, and I am completely satisfied. The wait time of a few weeks is a little frustrating, but well worth it.
As far as other concealed carry items:
* As already stated, don't fidget with your gun. Most people are blind and wouldn't think that you were carrying anything anyway. Everybody and their dog seems to have a cell phone or a PDA, so while you should try to minimize "the bulge", don't fret too much about it showing.
* If you carry IWB, start buying your pants a waist size or two larger. I'm a 32 waist, but I buy 34 waist to accommodate IWB.
* Learn to hug with both your arms low. Most people hug with the generic one arm high and one arm low. That's a great way to get made. Hug with both ares low, and they'll never know.
* Keep that situational awareness. Know what's going on around you. If you see a threat, avoid it if at all possible.
* Practice as often as you can, and strive to make your practice perfect. Shoot some IDPA to give yourself a little more confidence drawing and shooting from concealed.
Anyway, probably more than you wanted to know. Good luck!