Cell value based on multiple conditions

I need to create a macro that will calculate a value based on the contents of multiple cells. Looking at the example attached, if columns A and/or B (employee ID and name) are empty, then allowable OT (G) should be 0. If either have data, then if Stage (F) is CAN, G should be 20. If Stage is FAS or FAR, G should be 10.

I'm not very savvy with IF statements, which is how I imagine this can be done, and I don't know if this would be easier to do as a macro or as a formula within G. Since the contents of the of the cells will be changing on a weekly basis, I'd prefer the formula to only be there if there is content on the line, so we don't have nulls showing.

I appreciate any help I can get.