You have pretty much answered your own question..
My tip would be to:
– Not flood yourself too much with new music to start with – You won’t be able to DJ as well from a load of music that you don’t know – having said that though, if you’re playing that sort of music as background then you might as well prep a basic playlist before hand – it is hard to read a room when they aren’t focused on you!!
– Don’t bother with showing off your amazing mixing skills when no one is listening (IE when you are playing as background) – no one will notice and your effort will be wasted.
– Remember that people will start dancing when you play stuff they want to dance to – not that you should start playing popular stuff when they start dancing – it’s the other way around. If you suddenly change genre just as you get people up they are just as likely to sit down again..
Just my thoughts.. Good Luck!!
bob6397