I Have to echo what bowhntr says, there are far too many variables in a situation, not the least of which is what the individual officer(s) experiences and training are and how they play a huge role in what you can expect. You can generally expect to have weapons pointed at you. Hopefully, if there is more than one officer there, only one of them is dealing with you and giving you commands (multiple officers yelling multiple and often conflicting commands to a singe person in a scenario is a problem we see in training from time to time, especially when adrenaline is going). Follow those commands, move slowly yet deliberately, and tell the officers what you are doing. If the weapon is still in hand, and you are told to drop it, I would get it to the ground as safely as possible. DO NOT MOVE YOURSELF OR THE WEAPON QUICKLY OR IN THE DIRECTION OF THE OFFICER!
In short, prepare yourself for a very long day. If you don't already have the number for a good lawyer, get one and keep it with you. Make a brief statement but be prepared to invoke your Miranda rights to Counsel and stick with that decision. I teach CCW classes for my Agency (Sheriff's Office), and every class I teach, the students are shocked when I tell them, as I stand before them in my S.O. Uniform, that if they are ever forced to defend themselves, to only give the officers a brief statement justifying the self defense shooting, Beyond that, they should request to speak with their attormey before any more in-depth questioning begins. Some cops will take offense to this, some won't. Regardless, stick to your guns (no pun intended) and stand by your request to speak to your attorney.