I was diagnosed with adhd and after being on non stimulant meds that have seemed to do nothing i am wondering when and how i can start something like adderall or dexedrine for my adhd?

Whenever discussed and agreed upon with your treating doctor. Amphetamines are controlled substances with increasing scrutiny around them, high risk meds. It is only your team of doctors or the doc they refer you to that will be able to prescribe such drugs to you.

Have a psychologist do a neuropsychological exam to document the ADHD and then seek out a physician.