Which demon, god, or spirit do I start with?

My name is Johnathon. I have been reading about magick, whichcraft, and the occult for years now. I had just recently downloaded the ebook “Become a Living God” and I must say it is the most concise and intelligent magickal writing I had ever read. I’ve decided to take the next step in my magickal journey and attempt an evocation. But I don’t know who to start with. I am asking this so I can learn from your experience in this matter. Any answers will be of most help and greatly appreciated.