I just purchased a Berkowits 2200 S on ebay. I was wondering where I would be able to get needles for this machine and how would I know what kind of needles to get? I wanted to learn how to do this myself but only very basic instructions were provided. Would it be fairly easy for me to figure out how long to keep the needle in for and what intensity to use? Is there anywhere I could go that would offer this information? I would greatly appreciation any advice.