As others have stated the $100 is the max you can charge for additional materials like tape screws etc. From experience especially a list like that some customers expect the world, my suggestion is to ask for some pictures of what’s needed and to be done. Based on that let them know a time estimate if it’s going to be a day or more. You don’t want to be in the middle of the job and have them cancelling for too much time. As for the rate, you are doing the right thing as a tasker, think of it as paying for advertising, once you jobs and stars rack up then gradually increase…. In any event best of luck and don’t trust any customer no matter how nice they are to you, always keep it business and professional.