Loyalty marketing, buy 10 get one free cards can work well. Most folks rarely hold on the cards long enough to collect but if the do God bless em, they are regular motivated customers.
 
Using a free give awas service like groupon or the like is a horrible move.  You only attract penny pinchers that will only purchase when the can get something that will cost you money and don’t come back for full price.  The only one making money on thost things are the folks that sell the promotion.
 
localnet if on the money with getting you menu to all local businesses, schools etc.
 
Schools and local civic groups are also a way to get the word out. Contributing  Cupons for free combos when they have fund raiser or events will get the word out that you are a part of the community and bring in new local customers.
 
Never buy an e-mail list and send to it, that’s spam and its only popular fried in Hawaii.
 
Set up a Facebook page and have folks friend you on it.  You can then contact folks with specials through it and they can send those special to friends. Those specials should still give you a profit however.
 
G