Just because someone is a good writer, doesn't mean they can sell you a car. Remember that.
Direct mail will make you a LOT of money if you do it right... and it will literally bankrupt you if you do it wrong. If you try to save money by not hiring a SOLID marketer for it, you will end up losing much more than you thought you saved.
There is too much that goes into the direct mail campaign to explain in a quick answer. If you want some solid advice, feel free to set up a call and we will see if we can get some times to work.
Talk soon.
