Your header and the question in the body of your post differs in relation to emails, one is multiple files and the other is files!
Firstly, you click on the document and then you get an option to email it (arrow within a box, but this varies from app to app. This means that you can only send one attachment at a time. There is a workaround, perhaps with another app, but I just forget the answer at this moment.
Not sure about putting all your documents into one folder on the Home screen. Are you confusing this with organising icons into folders on the Home screen. See Ch 3 of the User Guide (Basics)