How to convert static site to Joomla?

Hi guys,

I’m sorry if I posted this on the wrong section of the forum but I’m having trouble with a client who wants me to create them a site but implemented into Joomla. I already have looked at this tutorial and it hasn’t really helped me. I got my webpage to load on Joomla but not how my client would like it to be organized. He want’s it set up so each menu can be accessed as well as creating sections.

Another problem I have is with the custom side nav bar that doesn’t read properly in Joomla.

Does anybody have any suggestions on how I can convert this static site I created into Joomla?

Here is my read-only link:

Here is the live-site link:

Thank you,