Since you asked the question, IMHO you have two ways you can go. You can stick with the police auxiliary/security aspect OR you can go for the rescue/EMS aspect. At this point in you planning I would pick one or the other and ride with it. Picking a specialty will let you stand out from the rest and keep you from being spread too thin to be noticed.
Honestly I would start back at square one and pick what direction you want to go in. Let the radio communication and equipment issue come to you rather than chasing equipment down BEFORE you have the reason to use it. It seems this is still a "plan" with some research.
If I were you, I get with a lawyer and start looking at starting a corporation or LLC for some type to backing to the name you chose. After that look at going the non-profit route and pricing liability insurance. Without the insurance or verifiable name, the real public safety departments will refuse your help in most cases. I would contact someone from your state CERT organization and ask them about membership and requirements. Then I would contact one of the larger security companies in your area and contract them to do the event/scene security for you. They can be cheaper than training, organizing, and certifying your own. This will also keep the heat off of you and your insurance if they go overboard or perform overzealous actions.
After that is all done, I would start looking at equipment including communications stuff. Also develop contacts in ALL of the public safety agencies in your area. They may have tips, pointers, or even hints at what kind of business your club may get. Also get away from saying "my" equipment since it makes it sound like a power trip coming from a volunteer organization organizer. It should be "our" equipment or "the agency’s/club's" equipment.
Thank you very much for your information,
I must admit, i sometimes put the carrage infront of the horse and i get to far ahead of myself,
I would like to try for the Police Aspect of it.
As i was saying, i was looking at the VIPS (Policevolunteers.org) and thinking of trying to incorperate something like that in my local police department here in buffalo.
I am going to contact my local police department tomorrow and see if they would be interested in sponsoring such a program.
I know that we have an Emergency Services Unit for the full time on duty officers, and they deal with specialized Emergencies and Mutual Aid Response, So i was thinking about down the line incorperating a Volunteer Emergency Services Unit that is affiliated with the VIPS Program.
I am not sure if this will happen, as i said, it is just a bunch of ideas myself and a few friends have.