There are conditions for the one who lead the prayer. Anyone can not lead the prayer.
Khutba must be deliver with in 5 to 7 minutes after the dhuhr time that means it must be Awwal e waqt
There are two khutbas which suppose to be deliver by the one who is going to lead the prayer followed by two Rakat salat.
Yes dhuhr is not needed but Asr is needed.
For further details kindly read tauzeehul Masayel.