London to Chester

I’ll be arriving in the UK tomorrow, landing in London. How can I get to Chester from there? I’ve heard that train fares can be as low as £20. My accommodation is near the University of Chester, but I’m unsure how to reach it. Could you please guide me?

Edit - Guys unfortunately all landlords are asking for a share code and due to delaying of eVisa i just dont have it. I need a place to live in Chester, pls suggest me some good option atleast for initial days.