dear sir, your answer wasnt clear for q2 and q4

Q2:i would like to know what is the contact information of south australia state nomination agency in order to apply for state nomination to my occupation as economist, my job is in demand in south australia which make me eligible to apply for regional sponserd 475 visa, so i would like to apply first for state nomination so what is the address and contact information of south australia state nomination agency (what is the address and contact information)?

Q4O i need to obtain specific occupational assessments from south Australia skills recognition services as requirements for my nominated occupation which is Economist. Or does Vetassess qualification assessment is enough for this occupation?