Using a guarantor

I really need to get out of my current living situation. I’ve broken up with my fiancé due to infidelity but I can’t afford rent on my own, not even most studios. I work in a school making about $38k in NYC. Someone suggested that I use a guarantor. I don’t have any credit either. Yes I’ve done my research but I still have some unanswered questions and would LOVE to hear from personal experiences.

So would I have to pay the guarantor a monthly fee on top of paying my rent?

For those that have used a guarantor, how much was the monthly fee?

Any other information would be helpful! I would be using an agency. I do not have family.