hi.. new to this can't understand where to start!

hello, i dont think you will loose a stone in 4 weeks unless you stick to the 1200 and exersise every day, thats at least 10 mins morning and evening walking, running etc, cutting out all bread and anything with flour in it, stick to veggies and fruit with lean meat like ham or chicken, there are some good diet spreads around, use crackerbread instead of bread its quite low on cals, no fizzy drinks unless they are diet ones and drink loads of water, hope this all helps