Let me help the best I can
I organize events in arizona and have been around organized drifting here since the beginning of it about 4 or 5 years ago.
getting started: it all depends on what you have access to. its VERY VERY VERY hard to do it alone with no experience. meaning if you havent organized or been around many organized events you wont know what to do or what you need to do it the right way.
your FIRST priority is finding a place to do it!!! talk to racetracks in your area. our first events in AZ were held at a paved circle track here in tucson and while we look back and realize we have 10x better facilities available to us now, everyone needs to start somewhere.
check for local organizations (not autocross groups, they dont like drifting.) look into NASA-type organizations that do road course events.
http://www.nasaproracing.com
if there are none, your gonna have to do it yourself. id love to help however i can so just keep posting in here and ill pass along all the advice i can.