KB is the amount of kilobytes your avatar is at. You can find out it's size by hovering over your id in a chat room. Your id is found in the scrolling id bar at the bottom edge of each chat room. The more items you have on the higher your kb will be. Hair, and voice boxes are usually very high in kbs. xD
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Do more clothes you wear, the more KB u have. So if u have allot of useless clothes u can remove them and lower u KB in that way
Really, it matters how the creator creates it. Lets take spikes for example. I have two pairs of spikes. Both pairs look pretty much the same, but are made by different creators. The first pair has very low KB's, but the second pair has so high KB's I can't wear them. Look out for sparkles, animations, pets, etc... those things usually have high KB's
Yeah I think it's plenty. You will see that each game has a certain amount of KB that it needs for saving. For example: Madden 12 requires 3,872 Kb of space. Gran Turismo requires only 256 KB of space. That's a total of 4,128 KB of space. 4GB is 4,194,304 KB of space. That's hardly a dent in the total amount of KB with the 4GB card.
4 gigabytes= 4 194 304 kilobytes
less than 15 Kb