I need to lose weight but how much is too much?!

I need to lose weight but how much is too much?

I am 24, 5'9 and weigh 250 lbs. I have a large frame. I gained most of my weight through my two pregnancies. Prior to becoming pregnant for the first time, I was 180lbs with 22% body fat, while in the army. I have lost ten lbs in the last month through diet and exercise.
Since my husband is deployed, I decided this is the best time to work on a new me. So, I need to know what range my weight should be in, as I don't want to be too thin but not overweight. I have seen weights ranging from 135-187lbs for my height. I was aiming for about 170-175 but do not know how low to go. Also, I need some advice on how to keep from having hanging skin. I know weight training and firming lotion will help but I do expect to have some loose skin. Any help would be appreciated.

the slower you work off the fat the less skin hanging you'll have.and 175 is still over weight however u said u had a large frame so it'll fit you. i would recommend keep losing weight until u think u look good but dont lose more than ur target of 175.