@1. What do you mean by publish? If you want to distribute your QlikView application to multiple people a server might be needed indeed, regardless if you are using reports or not.
Reports can not be displayed separately at the Accesspoint of the server. They are an integral part of a QlikView document. You have to build them in the QlikView desktop (see "Reports" in the top menu once a QVW has been opened in the desktop).
@2. Leasing a license is something you do in order to get your QlikView Personal Edition desktop to become a fully valid version where you also have the ability to open documents created by others.
If the server has a valid license you can get the reports and qvw documents to your users.
@3. You can't. Reports can not be displayed separately at the Accesspoint of the server. They are an integral part of a QlikView document.When users open a document (.QVW) on Accesspoint they can then open the report that's in there.