Build a Website

I want someone to look after the following woes regarding my already published website: Design: I am concerned about the theme. I want a theme for the home page and about page that is static. I want a different theme for my blog pages that are the four pages I added. The second thing is the picture of a creature that is going to be identity mark. It is important. Have you seen a diary? In it, there is a specific design on each page. Like it can appear anywhere artistically on my page like in footer or header but it must appear on each post page in four post pages. I am providing my background as well. I just wanted to tell you that I wish to have aqua blue and sea green tone and I want my site to be attractive which is not at the moment. Styling: I have learned how to add a plugin for font changes. I just want your opinion on which font and font size to use. Mobile friendly theme: I want to make sure that my theme is a mobile friendly theme. I can't check, can you make it sure. Plugins: List the necessary plugins I must install. SEO: Install something to make my website SEO friendly. Categories: I am adding categories. But the categories are not appearing. Please check them. Font to be use Template for all blog post automatic rating system to be installed.