Any mill programmers in here?

So Ive previously been a CNC lathe guy, and the little programming I did do I had software to utilize. I just started at this new job and they're testing to see what I know I guess, it's a very simple part but there's a few things I'm not sure about. They normally use I's and J's for radius values, but I was taught to use (R.125 I.e.). Also little codes that are different for the mill like g17, g83, g84, I don't plan on using cutter comp I'll just account for the radius of tool (.5" EM) If I could get some feedback I would sure appreciate it.

So Ive previously been a CNC lathe guy, and the little programming I did do I had software to utilize. I just started at this new job and they're testing to see what I know I guess, it's a very simple part but there's a few things I'm not sure about. They normally use I's and J's for radius values, but I was taught to use (R.125 I.e.). Also little codes that are different for the mill like g17, g83, g84, I don't plan on using cutter comp I'll just account for the radius of tool (.5" EM) If I could get some feedback I would sure appreciate it.