I am developed a custom PHP page with filters, addto cart module, music playlist everything. How can i implement it into WordPress? I am a newbie, any help thanks.

My custom PHP work directory structure :

location : public_html/my_work

website URL : website.com/my_work

Everything working good, but my wordpress heaer and footer missing, thats what i am asking to how to implement my custom development multiple PHP page work into Wordpress.