First, I'm not Steve, or Lisa...
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You have to start with the basics of
what you have to work with.
Enclosed is a diagram of such.
Disclaimer to those who flame- pls let's all go lay down by our bowl.
FYI Front will differ from rear fender well due to turning radius but same principles apply from a baseline measurment of A, B, C, and D.
With the same measuring points you can get the data you need.
Your NEXT task is to get measurements from the wheels/tires you desire AND measure those against the space/travel you have.
It's easier than you think! You got this man!!!