You don't need to bake. When you filter that is what sterilizes your mix. If you buy vials that are presterilized, just vent it with one needle, and filter in the solution with another needle/filter.
If you're going to bake it.. it's 15 mins after pre-heat. And yes, you will need to vent it with a needle. However, there's really no point, and it can cause oxidation in certain compounds and oils.