Michigan Jeeps' website

I have a large active Facebook Jeep group called Michigan Jeeps that I use to host trail rides and Jeep events every month. I want to have a website so I don't have to be at Facebook's mercy every time they change their rules. I have been building a Wordpress website that displays a Facebook group feed, Instagram and Youtube. I need to have a calendar and signup for events and a way to notify members. I also want a shopping cart so we can sell shirts and stickers. I have some stuff already sst up in Wordpress, but I really don't know what I'm doing and need it to look and function better. You can see what I currently have at MichiganJeeps.org.