Man its really up to you, if you understand nutrition it's a breeze. If you were already doing a program for bodybuilding Meal frequency and timing should be almost identical. No fasted cardio obviously, no keto, no atkins etc. Still keep protein high and maybe play around with fats/carbs depending on goals.
I'd say the best powerlifting nutrition plan is that of a bulking diet for a bodybuilder. Steady carbs through the day, a little more around workout, 1.2-1.5x bw in protein, min 90g fat for body function. This could change if youre trying to cut, make a weight class etc. Dont get cute like these fatboys eating doughnuts and shit thinking they can get away with it because they are powerlifters and dont care what they look like.
Whats your weight now? Whats your nutrition now? what are your lifts now? what do you want all these thing to be in 6 months?
see where Im goin?