You should always give your job a couple of weeks to settle in with 110% effort on your part. If you do want to change to another job, one can be found for you, although you should be aware that this may not be immediate and you will need to be in mobile coverage to receive job offers.
If you walk out on the job then it is unlikely that you will be offered another. Communication is key and if you aren’t getting on well with your job you must let our partners in Australia know and they will be able to help you.