What I've done is look up the maintenance calorie intake for the weight I would like to be and that's what I'm eating. For me, it's 1600 calories.
This way when I reach goal weight, I'll already be accustomed to eating the correct number of maintenance calories.
I used an online calculator which accounted for age and activity level too.
I'm "zig-zagging" the number of calories I eat per day too, so that my weekly total still = (1600 x 7) but every day is different.
I'm doing the zig zagging because I feel like I might have to "shock" or fool my system a bit since the last two times I tried to lose weight, it came off very slowly or not at all. So far it's working, I took off 11 pounds in two weeks, which I know is just that inital kickstart of water weight loss, but still, the last two times I couldn't even make that happen.