I ran across a special on Olive Oil bottles (really pretty) and I think I want to give them?!

I ran across a special on Olive Oil bottles (really pretty) and I think I want to give them?

to members of my family this year for Christmas with some good olive oil and garlic and rosemary in them (flavored for roasted potatoes). My question is do I have to do anything for the fresh rosemary or garlic or do I just throw them in there? I would also like to know how long ahead of time should I do this for the oil to be properly flavored? (I am interested in making sure the rosemary and garlic for sure don't go bad in the oil)

Go to about.com & search for herb-infused oils.
I did a quick search, and they have good info there.