Regarding sponsorship, all I can say is it is still possible to get one but it will take long and you need real effort to seek for it.
I've heard plenty of nurses here who joined the BP and IRON program and ended up going home because they didn't have enough time to search for work, much more a sponsor. It's a pity because some of them have loaned heaps of moolah back home. I'm saying this not to discourage you but to prevent you guys from putting yourself in financial trouble.
The key to success here after the BP or IRON program is IELTS and Money money money.
You need money to extend your stay and that's a requirement. If you can't do that then don't come to Australia.
Several of these nurses have tied themselves to 'agencies' or 'education-financial institute', loaning money to take BPs and IRONs here. Now they've realized that their Visa would soon be expired and still can't find any sponsors. They don't have the money to extend their visas and they can't afford to go home because they still need to pay the 'loaned' money. Now they are banging they're head because they feel trapped and doomed. They were too excited with their 'dreams', they have overlooked the future.
Don't think I'm crushing your dreams. I'm giving you a huge favor. If I can, I would like all these 'aspiring nurses' to know this simple truth. I want to save them before they put themselves in this situation.
Now if you have the financial support, then you have hope. I'm not saying that it's easy just because you have the money. But at least you'll have enough time to increase your education, find work, expand your network etc.