You are very welcome!* Yes, annuals would be the way to go with your location.* I sometimes have plants survive in a large whiskey half barrel planter and I'm in zone 7.
Don't hesitate to ask more questions once you've finished reading all those links!
You might want to add your state and hardiness zone to your profile.* That way folks won't have to ask your location when you have questions.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.