I am extremely new to this, currently still working full time (working towards a change of career) but I have been offered some work as a freelancer. I have been asked to write pieces for a food wholesaler who wants to expand his business into members of the public buying smaller quantities from him. I am going to complete a number of tasks including reviewing/showcasing new producers as he signs them up, creating and posting recipes so that people can buy the exact ingredients as a box.
My question is about charging him for the work.
I am thinking I will charge a per word rate for the articles but I will also need to charge per hour for research time, meeting the producers, cooking and photography etc. I will be expected to travel for meetings etc so I may also need to charge travel expenditure too.
How much is reasonable?

Thanks in advance!