Wordpress Theme Customization

Hello. I work in digital advertising as a Creative Director. I am currently building a Wordpress website using the Divi Theme. The purpose of the site will be to showcase my work (video and audio files, and lots and lots of jpgs). So far, I've set up basic templates for all my pages, with some support from Divi itself. However, I've run into some more complex issues that require someone with knowledge of Divi combined with html, CSS and possibly some JS. 1. When I started building this site, I didn't know anything about child themes. Now that I'm several pages deep, I realize that I should have installed a child theme, since the site requires much more custom coding than I had planned. I need a developer to install a child theme and migrate my existing pages to it, fixing any bugs along the way. 2. Since some of the work I'm showing is proprietary, an entire section of my site needs to be password protected under one password. I installed the Post Tags and Categories for Pages plugin, which allows me create categories and then assign several pages to one category. I also installed the Password Protected Categories plugin, which allows me to place several pages (not posts, but pages) behind a login. The trouble is that the login page generated by this plugin seems to combine the login functionality from Wordpress with a generic Divi page template that can't be styled using the Divi Theme's visual builder. Divi support tells me it has to be custom coded in CSS. I need a developer to custom code this (I'll provide you with the design—it's very simple). 3. I'd like to have a typewriter typing effect on the Home Page. I've tried coding this myself using code I found on the web. Unfortunately, it's not working properly. Also, I'd like to have more than one color text on the line of type that's being animated. I need a developer to fix the current code. 4. Install a smaller logo that will display in mobile (I'll provide the png). Based on my experience so far, there will probably be some minor CSS coding issues as well — snippets of code here or there to address styling issues. Just in case this figures in, there's no SEO required.