457 visa - you would need to find an employer (in AU) that is willing to sponsor you as a 457visa employee. Requirements are mostly 'standard' for all working visa which are
1. English Literacy - (take and pass an exam from IELTS or equivalent organization)
2. Skill Assessment - Accredited organization in AU that will assess your skill if applicable in AU setting
3. Health Requirement
start with https://skillselect.gov.au/
yan ang official website ng AU for immigrant hopefuls.