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I wouldn't worry too much about grease in the upper since its not going to hurt your function at all and will get cleaned out eventually anyway. You will want to lube the bolt and carrier well, paying special attention to the lugs and also the rails on the carrier. I also don't shoot anything new until I've cleaned out the chamber and bore to make sure there is nothing in there that can cause damage once you start running cartridges into the chamber and bullets down the bore. You'll also want to lube your fire control group as well, nothing liberal there but definitely want to make sure they've got at least a little lube on them.
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