Change Registration Page for AVS (Adult Video Script)

We need to change the registration page for our AVS (adult video script) site. The site is not an adult site we just used it as a template to start the site. Here's what we need... 1) Delete Gender radio button 2) Add drop down menu option (drop down to be provided) 3) Add the ability to add more drop down menu options in site admin 4) Add a second drop down menu option for sign ups (menu to be provided) 5) Add the ability for the user to create new category if the category doesn't exist Please see attached screenshots of what we need.