All good advice, Professor, if you haven't yet gone there, try http://www.sigforum.com/ they will have all your answers and then some. My SiG's prefer a light oiling and for range work some shooter's choice red grease on the contact points (rails, barrel and hood) but for carry a light oil will do. A nice IWB should work for carry many good holster makers out there, this one is new, but has a short wait time and the quality looks good http://monicakuehnleather.blogspot.com/2009/07/iwb-gallery.html Enjoy the P6, parts are fairly plentiful and minor changes are easily done by the "average shooter" without a host of special tools, although a SiG tool is a must and depending on care, a cheap change out of springs and roll pins never hurts.
Enjoy your new toy and keeps us informed how it works out for you.