Possession of Marijuana at Prom

My question involves criminal law for the state of: New Jersey

I am 17 and at my junior prom i supplied myself and 6 others in my limo with marijuana brownies. at the prom, two of the people i supplied them to got really sick so i decided before anything bad happened to come forward and admit to supplying them. there was never any payment for these brownies, i was just doing some friends a favor. When I knew something bad was going to happen i flushed everything i had on me. today i went to a rehab place and got evaluated as a requirement to be allowed back into school. i am currently suspended and i am supposed to be interviewed by the police sometime this week.

What should i expect to happen and will the details of this entire incident be available to the colleges i apply to?

You should expect that they might not accept you as a student.