Is it possible to route the output from GR, to the input of Logic Pro? Im new to this whole computer amp emulation/recording thing...

If it is possible could someone explain it to me, in simple terms?
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You click on the insets for your Audio track in Logic.
Then Inserts > Audio Units > Native Instruments > Guitar Rig 3 FX > Mono -> Stereo.

This will open up Guitar Rig under Logic.

Make sure you've got the right input channel selected for your track. Make sure the input monitoring button "I" is enabled in enabled on your Audio track in the sequencer. (its the one besides the record enable "R" button).

And thats it. Hit record and record your guitar.