Heya erm I currently weight 53kg or so, 154cm and would like to lose weight till 45kg

My biggest problems lie with my tummy, has a big load of flabs/fats there which I would like to get rid of :/ bf told me to jog every day for 30 minutes or so because that's pretty much the only way to get rid of stomach fats. And crunches (but not sure of how many I should do or when ;_;) so yeah..

Oh and would like to tone up my arms there (flabby flabby ;_;) and if possible to slim down thighs (does jogging help?) plus planning to go on a diet (no fried food, etc. yeah you get the point)

So uh would like help regarding how to tone up muscles at my arms there and regarding the thighs section, thanks guys/girls