Promoting a voice map tour best practice

Hi all

Hopefully I can get some advice on the best ways to promote a tour and which system works.

I have mostly been doing Guided tours in my small seaside town of Ilfracombe in North Devon Currently I have the following voice map tours which are a history tour and a ghost tour. I have recently released another History tour in another local town Barnstaple and I am currently working on another tour in Torrington.

Up until now I have been happy with just my guided tours but over the past month I have decided to promote the voice map tours but I am not 100% sure what works and what does not. My alternate goal is to have successful selling self guided tours which will mean that I can scale down my guided tours and concentrate on producing more voice map tours.

This is a new area for me and any advice will be very much appreciated.
Thanks
Mark
Devon History Tours