Peppers usually do well in pots. Beets believe it or not do better with a little sand mixed into their soil. Sun flowers doesn't take up much space. I would start them in a small pot and transplant them into the ground when they are small. Give them lots of water after u transplant them to bring them out of the shock and keep plenty of dirt around their roots when transplanting.. Beans spread out, I would put them in the ground. I would put the lettuce in the ground also.