Guessing by the scenario given, you suffered partial thickness burning... i.e, a nice watery blister on the burn site?....
As Sapper has quite rightly pointed out, cooling for minimum of 10 mins.....
The size of the burn will depend on the next plan of action...
Any burn that is roughly the size of your palm, needs to be looked at in A&E.
Burns round the moouth, nose, face, neck, genitals, regardrless, is best looked at in casualty dept.
Cling film is a fantastic burn dressing, but if it is used, do NOT wrap it round the burn.. in case of swelling. Just lay concertina type over the area affected.
One last bit.. DO NOT BURST ANY BLISTER !!!!.. Bacteria can get in and can cause cellulitis.... And you don't want that believe me..
After the burning sensation has gone,(maybe 24 hr,)use a skin moisturiser and apply gently to the area...It keeps the skin supple, and promotes healthy skin to heal better...