PPC Guide

Hi Friends
I am a newbie in the world of PPC and was wondering if someone could point to a guide or maybe give some tips. I reckon my question is very basic so I am sorry if it already had been asked. Here is my brief list of questions regarding PPC.
1. Conversion Tracking: I know how it works and I hve installed it as well. My question is, Is it possible to track the path that a visitor took when they are coming through PPC? Since we can see the completed sales and the keywords that generated those sales, is it possible to see how long a visitor went through other keywords that actually didn’t yeild any sale?
2. What is the best way to determine which keywords are really beneficial for the PPC campaign?
Thanx

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