If you have the required points in the Australia points calculator, you will receive a relatively quick invitation to apply. You should expect to be permanent residency within 5-8 months of applying.
The best way to acquire permanent residency always depends on the permit you want to apply for. Each immigration program has their own specific eligibility requirements, conditions, and selection criteria.
In addition, the government sets the migration planning levels and fixes a number of places under each migration program.