<< ok, now im really confused, what is thermal pad? and I read something about copper shim, what is this? This system is not going to be overclocked, so would the stock HSF and thermal pad be sufficient? >>
If you won't be overclocking, there is no need for extra conduction material. The thermal pad should be fine.
A thermal pad is just a small sticky square that adheres your cpu to your heatsink.