CSS modifications, responsiveness and mobile optimization Wordpress Site

I have a website made with an original Wordpress virtual education template where courses are taken online. The page is up but needs several modifications and activate some features from the template. The theme is [login to view URL] and the page is www.neurokademy.com. I need to know the price and duration to solve the following points: 1. That the page is completely responsive for all computer sizes. 2. That the mobile version is 100% responsive and that all its sections look good 3. Activate functions that the template has as Favorites ( I want to put this in the Menu) 4. Execute the list of modifications (CSS): This would be: Computers Homepage These three computers are like an image. So when you access the mobile version you do not see well or see the text. You have to use these computers with the builder and put them as independent images and place the text that is on the side and make sure it looks good in both the mobile version and the desktop. Responsiveness Menu - Categories-Be Instructor-Courses When you enter the page of some computers that have the smallest monitor, the menu is displayed and the buttons are not visible. Likewise it happens with the picture of the categories, images and texts of the section of us and be an instructor. Also when one gives a category that appears the courses the detail appears out of square. You have to make the page 100% responsive for different sizes of computers. Instructor section This section is like a photo, you have to put it in the same way as you see in the home page but with the builder of the template. That is to say that it looks the same but without it being a whole image. Right Size of the courses display When you see the courses they are in diferrent sizes, they have to be in the exact size. Combine image sizes In the main image of the course the images have a specific size. We place that when the detail of the course is entered, the same image appears but enlarged. It is possible to place in the course photo the image has a specific size as it is now, but in the image of the detail the image has another size that fits and does not look wide? How could this be done? Registration User or instructor The template has the option to register as a user or as an instructor but we do not see how to activate it. The idea is that in the registry people can register as a normal user or as an instructor. As you could see if you entered in the website there are many responsiveness issues both in Desktop and Mobile. I need this done in a profesional way. I also starting a tech company and I have found many clients that want to build websites. Therefore, Im looking for a developer that has the ability to build and solve all the issues of the clients website. Im based in the Dominican Republic and Im willing to pass you all the works if you give a good price. The price that I want you to give is like a Supplier and not a one time job. The amount of websites can be 2 or 3 per month in the beginning but this can increase in the next month. So If you apply for this work please make sure to give me the best price possible so I ican hire you in the following jobs of my clients. Thank you