IIFYM

When I set macros I usually do between 0.6 to 0.8 grams of protein per lb of bodyweight minimum. 0.3 to 0.45 grams of fat per lb of bodyweight minimum. Then the rest of your calories can go to whatever macro you choose. Total calories will be determined through trial and error. Myself for example: I with 200 lbs so protein minimum is 200 x 0.8 = 160 grams. Fat is 0.4 x 200 = 80. 160 protein is 640 calories. 80 grams of fat is 720 calories. Together that's 1360 calories. I can lose weight on 2500 calories. That leaves me 1140 calories left after hitting minimums. I could use them all for carbs or use more of them for protein or fat if I desire. You'll need to figure out your total calories from trial and error. Just pick a reasonable starting number. Feel free to message me if you need help or are confused about how to calculate values for your weight.

calculate tdee: http://www.freedieting.com/tools/calorie_calculator.htm

eat a 500-1000 cal deficit

ensure you get at least 0.82 gram protein per lb

ensure you get 0.45 grams fat per lb

fill remaining calories with carbs/however you want