NMAC

So after 26 years I have decided to go back to the UK after a recent holiday there - what do I have to do in terms of being allowed to work there again? Is it just NHS that I have to get sorted? I have got family finding out some stuff but am keen to start some research - whats the best site for me to go on? I am an Australian Citizen and currently do not have a UK Passport - is this something that would be favourable? Also whilst there and I come from the south coast I could not find out where to start looking for a job - they don't seem to have something similar to Seek? So many questions hope someone can help :biglaugh: