Keto diet help please ?

So I've been advised by a doctor to go on the keto diet im the first to put my hand up and say I know nothing about food I really dont I struggle with knowing how to eat healthy I dont have much understanding what is good and what is bad etc but I really want take it seriously and do it properly I'm really hoping someone can show me like a general food schedule maybe something you do I can follow as a guideline until I start to understand it and get used to it I need some help with getting started or even a simple and understandable list of what I can and can't eat I can even pin up in my kitchen I will get used to looking at . Thanks