Where you live, it might be better in a pot, because they are a little tender. If you want it in the garden, it needs to be a sheltered, sunny spot, out of cold winter winds, and not in a frost pocket. If you want to pot grow one, use John Innes No. 2, feed in spring and then in summer with a general purpose liquid feed.

Yes, a pot is best. Use a nice terracotta one and trim the olive to shape it and keep it bushy. You won't get fruit worth eating though. Just a few small 'berries'.