How can I make this idea work?

I’m interested in setting up my own business based on what I’m good, at, my skill set etc.

What I want to do is set up a company that creates holidays/adventure holidays, experiences etc all over the world and at home.
Its going to be UK based so I won’t be planning for people outside the UK, too complicated…

My idea being that people don’t have the time these days or the ideas and world even local knowledge to plan something original and amazing and that they would pay for this service.
Some companies like this exist to some form STA travel being the biggest although only offering very generic products, and more of a travel agent tbh.

Now my problem is how do I charge for the service because a lot of planning can go into these things?! I planned a rally to Russia last yr, it took a fair while lol, I presume you have to tier things and/or quote?

Any help from you experts would greatly help me begin to get my head around more and more of this before I put too much time in.