Which of the below skilled visas you are applying?
Skilled Independent Subclass 189 - It's a non-Sponsored Visa so you don't need a sponsor for it. However, your occupation must be listed in latest Skilled Occupations List. For further details, check the Subclass 189 Visa page.
Skilled Nominated Subclass 190 - To apply for this visa you need nomination from a State or Territory Government Agency. Moreover, your occupation must be listed on the Consolidated Sponsored Occupations List (CSOL). For further information, visit the Subclas190 Visa page.
Skilled Regional (Provisional) Subclass 489 - To apply for this visa, you must have a sponsorship from an eligible relative living in a designated area or a state or territory government agency in Australia. For further details visit the Subclass 489 page.