How do I correctly and properly take screenshots of my male "Nord" character in Skyrim PC Windows version and post them on here???, please help.

Press F12.

Additionally you can use console commands

tfc = toggle free camera, let's you freely move the camera around.
tfc 1 = same as above but also freezes time, http://steamcommunity.com/profiles/76561197988732882/screenshot/648746999493295721?tab=public.
tm = toggles off all UI elements. Including the console, so disabling it can get tricky.

In Steam F12. Not in Steam. Prt Scrn. Skyrim has a built in ability to take screen shots, and they will show up in your Skyrim directory.

I've heard people say the Steam screenshots use rather lossy compression but that's fine for posting online. The in game print screen ones are lossless BMP files (but don't upload those to share with others unless sending them the file directly and they want a large lossless screenshot).

The print screen button screenshots get placed in (Path to Steam)\steamapps\common\skyrim, which is actually amazingly sloppy and probably ignores Windows Vista/7 standards for writing user data files, which should not be written to program data folders.