Guys I highly recommend getting your skills assessed, Im a telcoms tech and was assessed by Milcom, (they also run CCTV security training) you will need license and probably Open cabling license here in OZ ,, Everything is about certificates over here... you even need a certificate to make coffee ! https://milcom.edu.au/technical-security-courses/
That would be a good place to start, its not cheap but I know it helped me as I was like you with no formal qualifications. I actually came here on a 2 year working holiday first and completed some training with milcom first then went back to the UK. I applied to loads of jobs until I was offered sponsorship. I love Australia , its worth it !