Start with installing the connector. Pick one version, which fits your SAP environment.
When you install SAP connector, it will place a help document in the installation folder (Custom Data folder). I would recommend you to start from that document. It will cover mostly on how to make connection to SAP and how to download the data. Enclosed is the document extracted from v5.5, in case you do not find it in your installed system.
Once you have gone through the document, and made first connection/download, they next step would be to get SAP Application/Extract templates provided by QlikTech. For this you need to contact them directly or work with your QlikView partner.
Hope this helps you.