In other words how do i know my calorie intake needs ? Mine coud be 2500 while the next person need 3000 how do i figure out what my body needs depending in size and weight

Once again,you are your on best judge.I cant sit here and tell you what will work for you,you want an answer that you can say ok this will work for me,not gonna happen!pick a plan,stick with it,not for 2 weeks,for no less than 8 give your body time to adjust,then you can start to tweek it to what your goals maybe...but you gotta start somewhere...so start somewhere!!