definitely check out Oreo Liberty on YouTube, worked amazing for my horses!
My favorite YouTube channel for Liberty tutorials is Oreo Liberty
I started by doing Join-up. If you don't know what it is, I would suggest looking it up because it's kind of complicated to explain! But it definitely helped connect me and my horse. Also, if you just start by walking around in the pasture or arena and praising your horse for following you and doing different positive things, that will help to!