The evolution of the Sun (a typical MS star) itself isn't too hard to model, and there are multiple, mutually consistent, scientific models on it - see my post
here. The bigger issue is, of course, the evolution of the planetary system itself, which we don't know too much about beyond very broad generalities (and even then, it would require computing exact solutions to some complex stuff, like the n-body problem - which is generally chaotic for n>2 - computations better done on a super-computer than on your home desktop...)