My wordpress admin panel is pretty messed up.

Hello i need help regarding my admin panel. I m a beginner in wordpress development and i have created a website. But the issue is i built it with whole lots of template. Now if i want to give this website to a non technical person. how he will manage the wordpress admin. because its whole lots of template and he dont know php and etc. kindly help me tell how should i do i built my website so that it can be easily managed by the non-technical guy(say my client). i m confused please help. please tell me how we start and all the steps required to build in a wordpress website. so that it can be handle by me easily and by non technical person. please i need help regarding this. please help me.