Establish a very good connections with local support staffs like Cab drivers, Hotel personnel, house stays and Cooks. Then build a strong advertisement propaganda in social media. Know your customers and identify what other such tourist agencies are lacking and include that in your company.
Identify your target audience (backpackers, family, couples) and design customised itineraries to suit this specific group. Tie up with vendors/partners for hotels and transport. Establish media presence, you can choose multiple platforms like facebook, instagram.