Add WYSIWYG to comments and Ajax customization around a website

I'm the owner of [login to view URL] - this is a Brazilian Q&A website, written in Portuguese (you don't need any Portuguese skills for this job, I speak English). I built the website and now I need someone to implement the specific listed parts: 1. If you click on a question, you will have the option to insert an answer. I want WYSIWYG + AJAX there. A user must be capable of insert an answer exactly like it happens now at [login to view URL] Example: click to answer a reply to [login to view URL] (the only difference is that I need Youtube videos included). There are a few WP plugins that have that and much more to be used on backend, to write posts. I need this on the answer place. 2. If you look at the content on [login to view URL] you will notice it uses pagination (which is broken by the way). I want a AJAX to load more data, no paging. Just like how it works on [login to view URL] or Facebook's timeline. When the users are reaching the end, just give them more data. 3. This is one is more on the architecture of the site/theme. As you can notice, the site has a main sidebar where the content goes in. Today, when you click anything, the whole website reloads. I want just this sidebar to reload, using AJAX. Everything else should just continue working, we'll just refresh the main content. I need (1) and (2) done in 1 week at tops. (3) can wait a little bit more. There may have more work in the future if the partnership works fine.