Nah, try it! You’ll get a folder called “Manuscript copy-1” or something, and it will have a regular folder icon, not the special icon which indicates where production text goes.
Just remember that folders and text files are essentially the same thing, and you can use them however you like. Take a look at the article on them in the FAQ for further advice on how they can be used. Don’t worry too much about it! You can always right-click on something and change it from one to the other if your change your mind.
You might find, as you start editing, that you’ll want to cut your chapters up into scenes. Scrivener is exceptionally adept at handling lots of small bits of information, rather than huge chunks of book. Having things cut up means you can be more flexible, your searches will be more relevant, and meta-data can be more precise. The Edit Scrivenings feature means you’ll never have to worry about things getting too broken up to work with.