Rating and Poisson distribution

I can make a rating Poission distribution with Excel based on goals for and against. But how do you add another stat (like shots on target, possesion) in these ratings? Can someone help out?

And when a stat is added; can I give value to these stats? I.e. goals x 1 and shots on target x 0, 8?

Or do you get two distributions?

My wish is to get one rating (based on several stats) to compare.