Depending on the location of your range you will need to decide if it is easier to vent through an outside wall versus up through the roof.
Range hood vent through metal roof.
Try to keep it close to the fan location.
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My range hood was vented through the roof but is not centered over the range hood.
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Start in the attic and drill a hole through the roof in the desired vent location.
As a result it looks awful from inside the house since it abuts a beam that runs across the kitchen ceiling.
The trickiest part of installing a range hood is determining how to run the ventilation ducts.
Leave the drill bit sticking through the roof so you can find the hole.