Well there is no really fast way for this.
Now reloop has promised a mapping for VDJ soon(TM), so one possibility is head over to the reloop site at:
http://www.reloop.com
Log on to their support forum and ask for that mapping.
If you want to map yourself, you first need to read and really understand this:
http://www.virtualdj.com/wiki/VDJscript
If you are a registered user of VDJ Pro you can also log into the download section and forums and ask for help there. Usually the guys at the VDJ site are really helpful and nice and there are tools that only VDJ Pro users can download (and for example solve any jogwheel issues).
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