From my own experiences of being a noob (which I still am, mind you) I don't think looking at finished koth maps is the most useful thing to do at this stage. Studying existing maps is really useful when you have specific questions ('how big is a normal-sized door?', 'what does a good flank route look like?', 'which are the prettiest red concrete textures?' and the like) but when one needs to learn map design from scratch they can be quite impenetrable. I remember looking at official maps and thinking 'They have some terrain and some buildings, mine has some terrain and buildings, why do they work while mine doesn't?'
Instead, NuclearRadio, I recommend you to read some of the many lovely tutorials available on this site, then look at WIP maps, how they feel and the feedback they get. Learn to recognize the geometry of maps and identify its purposes.