Can someone help me set up my shipping methods? I don't know how to do it
for US shipping.
There is no one-size-fits-all method for shipping methods. You are going to have
to do plenty of research. Do not use the 'Shared Methods' here as they
are not maintained or guaranteed to be accurate.
I would advise setting up only a Manual Invoice method until you know how to
ship and how much it costs.
Go to USPS to learn about the shipping methods available. But buy your postage
online from Shipstation or Pirate Ship.
Spend some time on other sellers' Terms and Shipping method pages. See what
they have set up and decide what might also work for you.