For non-union work, there are no rules. Actors get paid whenever the producers decide to pay them. It could be before, it usually is after, and sometimes, not at all.
Can I wear jeans to an audition?
You don’t need to dress like you’re going in for a corporate interview here. Your clothes shouldn’t be a wrinkled mess, but you also shouldn’t be wearing business attire to an audition. A good pair of jeans can go a long way, and it’s worth investing in a pair for auditions alone.