I can make a reliable 30k a year from a small business. How to use this?

My brother and I plan on starting a mini trade school. We are both high end managers at a local business where we do hiring/firing/etc. Our company doesn’t want to have anymore trade schools ran through the office as it takes to much time/money so we decided to do it on our own outside of here.

The school is $1,000 for 5 weeks. After those 5 weeks if you can pass out on boarding test we will guarantee a job.

We expect to be able to run 30 students through our school a year, so $30,000 a year, with practically no expenses.

We don’t see a lot of room to grow but how could we use this money to help us grow into other businesses?