I am new to this and want to add my OC's to the Wiki but are OC's paired with Canon characters okay? And if so can I create a whole different page for that canon character outlining how I changed up their story in my fanon?
The answer to both questions is "yes". You're free to link to a canon (either Disney Canon or Legends) character on Wookieepedia, but it's equally acceptable to make an article for your own version of a canon character. The only thing you can't do is link to someone else's article on SWFanon without permission.