NHS Members get £4,000 per revive.
Below is what each Rank gets paid per 15 mins:
and yes there is an XP system, each revive gives 150 XP (I think), Medics can prestige in reviving if they get enough XP
Any other questions, feel free to ask..
I'm assuming you mean the landing Pad?.
If so, to use it you need to land near the area, whilst in the pilot seat press 'Windows Key' and it should bring up the Mod Menu.