WALKING TO LOSE WEIGHT...IS IT REALLY EFFECTIVE....TIRED OF BEING FAT?

I live in columbia sc its a lil bit hilly and hot down here and im trying to lose some weight im getting fat in my old age lol well im only 23 but lately ive been lazy n my appetite is insane I dont understand it...when u sit around alot does it make u hungrier????? And all I wanna eat is cup noodles !!!!i wanna lose some weight but how much would I have to walk a day im 5.8 and about 180 most of my ugly weight is going strait to my arms and stomach it seems....i have had two kids....so I also wanna know some good weighs to reduce that lil pooch that hangs down ...belly fat... And are there any particlar excersises I can do to get rid of my ugly man arms they r so fattttt omg help plz.