All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If you can limit yourself to selling only bread, candy and other lawful items, and you can completely avoid selling alcohol, then there is no harm in working in such a place, otherwise it is forbidden for you to work there.
For your second question, please refer to Fatwa 82147.
For more benefit on the prohibition of alcohol in Islam, please refer to Fataawa 81900, 81389, and 81461.
Allah knows best.