If you can find a job with HSBC or elsewhere, the paperwork to get permission to work is easy if your husband has an EP. You only need a "Letter of Consent" to work on your Dependent's Pass, which is unlikely to be turned down. You can of course apply for your own EP through your new employer but that is a more complicated process. EPs are specific to each job so you have to find the job first, then apply.
Schools are difficult at the moment, with most having waiting lists. If you want a southern hemisphere school year, the
Australian International School is your best bet. Local schools also run from Jan - Dec. Other
International Schools here have an Aug/Sept - June/July school year. See the other post in the families and kids board about school listings. You need to check the individual school websites and contact the schools directly about places. Normally I would say visit them first with your boys and see what will suit your teenagers, but at the moment you may have little or no choice. ERIS is fairly new, so isn't full yet as far as I know.