Get into the practice of praying. It'll feel weird or awkward at first if you're just coverting out of athiesm. But keep in mind you're addressing an omnipotent entity who can and is reading your thoughts at all times. So if it's easier you can start by just thinking a message or two specifically meant for Him to hear, tell Him what you liked today, what you're excited for, ask questions, request things or blessings (especially for others who you genuinely want to receive them), he's your King but he's your friend, get to know Him a little.