My father is in the process of arranging interviews with some of his co-workers in order to help me get character references.
Is the plan for you to interview with them? If they don't already know you, this isn't what the selection board is looking for; they already have an interview process. They're looking for people that have known and observed you for some time; ideally with knowledge of what the program/community you are seeking needs
However, he says he needs an outline of what the letters need to say other than what I have found on this site already. He told me military letters of reference are usually fill in the blank, so to speak. Does anyone have any suggestions?
Best source is your OR as AYCE stated above. It's NOT fill-in-the-blank, but there are areas that should be addressed. If an outline is given to his coworkers, the letters will look so similar that anyone reading them will suspect it was all scripted. No doubt your dad cares, but YOU should looking at your adult life and who knows you best:
Biography
I am currently a full time college student at Austin Peay State University.
Location
Clarksville, TN
Occupation
Delivery Driver, full-time college student
Interests
Running, Weight Lifting, Sigma Chi
Latest News
I am currently in the process of applying for the BDCP.
Favorite Quote
"Knowledge itself is Power"
Looking at your bio, right off the bat, you should be looking potentially at a professor, someone you work for (not using someone from a job would make me wonder why you don't want a supervisor/employer to comment on your character, self-discipline, promptness and attention to detail), a former or current coach is always a good choice and you might want to consider someone in Sigma Chi hierarchy. You ought to try for at least one service member (or former/retired one) who knows you (ideally one of your professors or coaches if you are lucky enough to have an active duty connections).
In addition, I am applying for NFO or Pilot, would it be more beneficial to use warrant officer references over Commisssioned officer references?
Answer: depends...is your dad finding them or are they someone who knows you well (Does this mean his coworkers are Army aviator types?) A Warrant Officer who has known you for years and can say,
"I've watched J mature and in course of having him in and around my family working on my (insert yard, car, whatever), I can attest to his work ethic and steadfast devotion to anything he undertakes. This lad is someone I'd particularly want not only in the service, but serving in my unit. He has obvious potential and motivation to make through flight school and excel in anything that comes his way" carries more weight than a commissioned officer (even a senior one) commenting on you based on an interview.