Anyone know what is the procedure to live in Singapore or to get a PR status

Hi, I've recently graduated from Uni and I was wondering what is the procedure to either work or live in Singapore, I know there's a scheme call AIP open for HK citizen (btw: I'm born in hk and lived there till 12 and currently holding a US passport and Hong Kong SAR Passport).  Is it quite hard to get a entry permit/ PR status for Singapore, also, what is the NS status for immigrant that like me are 25 years old.  Thanks.