How can a business that is already successful in reaching their local market extend their marketing reach online?

The good news is that the traditional offline marketing that has always worked so well will still work at least as effectively to promote your online presence. The other side of the coin is that to promote your business online, the old traditions need some updating to keep up with online marketing best practices. What are these practices?

I would suggest visiting the neighboring countries and seeking wholesale distributors of such products and sell them your products. They may have interest in your products and you can go from there.

Good luck

Transferring previous offline marketing/ad techniques to an internet brand seldom works. This what a lot of people failed to realize in the early days of ecommerce, which resulted in the dot-com bubble burst.

Please i recommend you read. '11 immutable law of internet branding' by Al Ries.