Finally is the message templates. You really don’t have to do anything to these to get your store going and just use the defaults.
If you do want to change one click Edit. Below there is Conditional Block Macro Tags and Basic Macro Tags. Open these up in another window and browse through them. You can see how they are used in the default messages. I changed the wording on some of the messages and also made them simpler, shorter and easier to understand.
With all the settings now set your store is closer to being opened. Probably should add some inventory first.