When I first started, I thought I would do really well and have an advantage over pretty much everyone if I took into account, not only the normal stuff (distance, wind, etc.), but also the elevation change (e.g. 3 ft up, 10 ft down, etc.) and the slope of the green.
I quickly noticed that the results for iron shots didn't really follow any mathematical formula. Of course, there are mathematical formulas for this or that -- for example, formulas work exceptionally well with putting -- but at the end of the day, memorizing certain adjustments (e.g. adding 5 yards onto your shot, subtracting 4 yards from your shot, etc.) produces far better results for iron shots than trying to plug every iron shot into some master equation.
Of course, you will never be able to get exceptional left/right aim with your long irons, and they will rarely stop on a dime like a PW+, but if you memorize certain distance adjustments (which you will have to figure out on your own), then distance will almost never be a problem. There will be shots that are impossible from really far out, where if you hit it too soft, you land in a bunker, or if you hit it too hard, you roll off the green, but you have to do the best that you can, and sometimes the best you can do is 15-30 ft away from the pin.