It starts with a response
Following Jesus begins with two simple moves: repent (turn toward God) and believe (trust Jesus). That's the doorway - everything else is walking through it.
"Repent" sounds like a scary church word, but it just means an honest U-turn: "God, I've been running this my way. I want Your way now." It isn't groveling - it's coming home.
"Believe" means more than agreeing Jesus existed. It means trusting Him - like sitting in a chair, you put your full weight on Him. You believe He died for your sins, rose again, and can actually lead your life better than you can.