If you want quick barspins a good threadless headset is a good idea. Something from cane creek or FSA is your best bet. Just remember if you don't get a sealed one to clean it and re grease it every 6 months or so.
And wheels bearings, well just pull them as far apart as you can, and put all of the parts in turps or petrol or kerosene or anything like that. Then after they have soaked for ages take them out and dry them off. Then hit em with 3 in 1 oil or singers oil or bones speed cream or anything like that.
That pretty much all you need to do to keep your scooter functioning well. Just remember to look after it and give it a good wipe down every now and again
Oh, and don't ride in the fucking rain...