How much there is to earn after getting job as tour guide?
It depends entirely on your country and the level of experience you have.Also,what is your line of expertise.Guides in adventure travel market earns more than a historical/city tour guide because of the nature of their job. At entry level you may not make much but guides significantly make more on the sides like tips and where they have good relationship with the local water holes.And if you are fun and engaging,you can rise up pretty quickly.
Good luck!!