Are there guidelines to know whether a case will be able to stand up in a court of law?

Well guidelines in the legal world refer to the elements of a cause of action. In a motor vehicle case, it's the negligence of the other driver has to be shown, you have to show that the negligence caused injury, and then you have to define what that injury is, what the elements of harm are, that you're seeking compensation for. If you have validity to each of those elements, then you have a viable case that is worthy of prosecution.