Screenplay adaptation for film

Mental Dental (MBP) is a great story.
A heroine who battles to save her career,  clear her name and solve the puzzle that is causing the deaths of so many by innocent perpetrators..  A web of mystery and intrigue.
I think it works on the small or big screen. However it's a big ask to convert this into a screenplay,  never mind a blockbuster. 
I am trying to build the courage to attempt this.
Any hints are welcome.
Any direction too...  Especially any unpaid volunteers... 
Wish me luck