No one is going to tell you how to fight again, but I could fill you in on more information, and you could accompany me on a hunt if you wish.
It's not a waste of time to be well-informed, considering where you are. My point is that here, anyone from one of those realities could arrive and could have some effect on any of us, you included, so it'd be wise to fill in some of the gaps now. For example, you and I have something of a different history in many of them. For another, Steve had a son that he named after you in one world...who is here.