Be careful who you trust. There needs to be vetting done by the NCAA with standards/testing for “agents” just like in professional sports. 

Anything close to 20% is highway robbery and you are being taken advantage of. 3-5% is a fair standard commission on signing bonuses and should be used for NIL deals as well. Right now it’s the wild west in NCAA athletics and anyone can call themselves an “agent” with no formal background or experience.