Hi guys, names orlando, I have recently sold my 2003 E46 M3 and decided to buy a Boxster S! its a 2004 with 43,000 miles, its a manual! Anyway as i don't know much about the Boxster so i need your help

so here goes,
1) I installed HID's in my low beam and fog lights and the odd time the oil + battery warning lights will pop up? It did it once when i was driving and once in the driveway when i started the car should i be worried ?
2) After using the car for lets say 20 or 30 odd minutes well anyway after the car is warmed up and i park it and turn off the engine, if let to sit for 3 or 4 hours and i go to start it up there's a banging/tapping sound coming from the engine and i have no clue what it could be? and the banging is continuous untill i stop the engine and start it back up, what could it be? it only does it if let to sit for 3 or 4 hours?
3) When the engine is fully cold there seems to be a hell off a lot of smoke coming from the engine, now i know its a boxster engine and its suppose to smoke a little bit but i think mine might be smoking too much!
4) the key that i got with the car doesnt open/close the doors or the trunks? and the led light wont go on at all on the remote so i ordered a new key from porsche and went down to have the new key programmed but porsche told me that they cant program it because the car wont accept the codes? has anyone come across this?
well anyway thats it for now guys thanks in advance for your help!!