Need help figuring out what boxes to buy

I recently built a 10X20 shed in my backyard in Georgia, I've hired an electrician to run power from my house to my shed. He told me to buy and mount the outlet boxes before he came out so the outlets are where I want them. This is an uninsulated shed with exposed studs. He didn't specify what kind, Home Depot has many options, he is not answering my texts, and I need to do this today. Any suggestions would be great, I'm putting in 4 outlets and 1 switch, one of the outlets will be in the switched ceiling so I can plug in a shop light.