Hi sazm thank for the information, it was very helpful, I now have an idea of the expenses along with information that I collected from other places, I am applying for subclass 190 visa as a University Lecture and the only region that is open for University Lecture is the Northern Territory, I am currently filling up the Northern Territory form the link for which I am posting at the end, all my relatives and friends are either in New South Wales and Victoria, so my migration agent asked me to find people in NT, probably on forums who would be interested in being my friends providing me all information about NT, and (SECTION 4.4 ON THE FORM)list them as you will see on the form below. If you could help me by any means here I would be really grateful,with a name and contact as you see in the form, only if you would be comfortable with it, and if there is any information about me you would like to know I would be glad to share it.
http://www.australiasnorthernterritory.com.au/Working/bsm/nt-nominated-general/Documents/489_190_sponsorship_application_form.pdf