Do tourist routes belong to tourist products?

It's a tourist product. Tourist routes include the design of tourist routes (transportation, tourist destination, accommodation, time arrangement, etc.). )

How to develop: First of all, you should do market research, feasibility analysis and so on according to your tourist route products.

Marketing means: network marketing, TV media marketing, advertising marketing, etc.

There are too many books for your reference: Handbook of Tourism Product Design and Operation (Zhang Daoshun) and Tourism Marketing.