Best to consider "offline" and "online" as part of the same overall effort. You'll need communications to be visible to those who'll find your services relevant. Start by talking to your customers if you have them to find out how they heard about your services. If you have no customers then you have an entirely different challenge and you shouldn't be worried about the differences between on or offline channels -- in this case, find someone asap who can benefit from your services, then go from here.
