Looking to start a Mortgage Brokerage

I have a cert IV and Diploma in Finance and Mortgage Broking. 2 years as a brokers assistant and now working at a bank. Now I’m 21 and wanna go out on my own with a few buddies of mine. What’s the best way to go about it? Which aggregator should I use? Do I need a mentor? If so how does a mentor benefit my business?