[Maryland] About to be unemployed, what should I do before my next job?

I had backup plans a few months back and put my all into making some kinda of safety bet once i leave ny job because my job was causing me so much stress i had to go to the doctors and i might one day consider therapy when i get a job again. I apply everyday and while the decision to quit has taken some of the stress off me, today's doctor's appointment told me there might be more doctor's visits to go so I can be clinically well again. I've had this job for 1 year and 11 months, and it was something my parents set up for me even tho it was so far away and cost me for travel and the alternative was emotional abuse from them while stuck in the car with them. I'm still in my twenties, I'm aware i need something with benefits for stuff, even while living with my parents. So far I've called the jobs i applied for and I'm getting a waiting period of things still being considered... but in case that might take a while or might not happen, i need to file for unemployment but i don't know how to do that. Any advice?