you will find a bus stop outside the airport - not too far to walk. but are you sure that you will take the public bus??? it depends on your luggage and on the place you will be going to ... i'd recommend to take a taxi.
think it might be difficult to immigrate without an address where you will stay. once i forgot to put the address of the place i stayed in the form you get on the aircraft and that you have to show at the immigration - the officer was not really happy about this. i had to give the name, the address and the phone number of the people i stayed with before i was allowed to pass ...