well, we really
are the beginner's guide around here! no guides we know of, exept for the tutorials. please feel free to ask though. we all have! and we don't chuckle long. then soon you'll get to chuckle yourself.
right click the layer (if it's a shape) in the layers palette and choose rasterize. if it's not a shape, then you don't need to, it's already rasterized. depends on how you started. there's a million or so ways to do anything. if you used a circle shape tool and drew a circle, you'll need to rasterize before you can delete the hole in the center. if you used the circle marquee tool and made a circle selection then filled it. it's already rasterized, so you can just delete the center. hth.
and i'd recommend trying the tutorial for a basic page at the bottom of the ps page here. informational, tutorials, ps. it'll get you familiar with the tools and settings. nothing fancy, just basics. and yeah, i wrote it. but feel free to post any questions any time!! that's what we're here for! Ü