Both models are common. The right one depends on your goals and risk appetite.
You get a percentage of what you earn. Best when you expect to grow — your income rises with the account.
You get a set amount (often weekly or monthly). Best for stability and if you are just starting, since you earn regardless of a slow month.
Tell us the deal you want either way: a percentage split, or a fixed amount like a monthly salary. We set it up and get you going — extra terms like a weekly bonus included.