I have an idea to share with you. Maybe this idea is not new but...
I have one idea about advertising for markets, supermarkets, shops, etc. Just make some stickers with information about your shop (address, etc) and with small map, and words like "Come!!!"(You can put any words you want). And put all stickers on cigarettes, alcohol, boxes of juice, etc.
This ad will be very useful especially at the beginning.
Also you can make some money by putting any ad of different companies on your products.