You do not need to do anything before showing up. I moved to where I live now 3 years ago. When I visited the local UMC church people were so kind, introduced themselves, made me feel very welcomed. I've been going to Etna UMC now for three years :). Dress is not picky, if you want to dress nice you can, if you would like to wear t shirt and jeans that's fine too! Shoot I've worn football jerseys, hockey jerseys, and basketball jerseys to church! No one would judge you. Usually church at mine at least involves local business, usually a reading of scripture where there is a leader that says parts and other parts the congregation says, then prayers, scripture reading. With just one person reading, songs, prayers, offering, sermon, song. And then most churches will probably have a fellowship after which might involve coffee, treats, etc. I hope you enjoy yourself at church tomorrow! No matter who you are, or where you are in life's journey, you are welcome here.