Astronomy / Space Planetary System Models?

I'm looking for some mathematical models on how planet systems are formed and to calculate semi realistic planetary systems procedurally. I'm fine with the programming side but I can't really find any good starting point on the probability of what sun type, how many planets and so one are in a system, nor did I find anything how to generate (semi) realistic orbits.

Has anyone a good starting point for this?
 
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