Good for you for embracing health, fitness, weightloss and a new frame of mind as re: eating/ snacking/ exercise, and carrying stress.
some tips-
get/ borrow a dog. They are always happy to go for a walk. They are always happy to walk an extra block. they need to go out twice a day. they offer love encouragement and support. they don't talk back.
I am blessed with a good frame, a healthy weight, a healthy appetite, and a good sense for my stomach. I cannot eat too much, it is a challenge and a chore to have a big portion of even my favorite foods. Instead I eat 5-6x a day, drink plenty of water, and love fruit and veg above most everything.
unsweetened iced black or herbal tea. fruit infused water, iced coffee are all great substitutes for soda. if you want, try some of the flavored seltzers as a no calorie, no sugar, no sweetener step down.
In terms of salty snacks, I like nuts. you can also do fresh or cooked veg with a bit of mrs. dash or salt alternative.
if you are bored at work. ask for more work. play mental games like, count backwards from 100 by 7. name all the state capitals. commit the rivers in africa to memory etc. take a brief walk. do subtle desk exercises, like contracting your calfs, shoulder rolls etc. take a walk to the ladies room.
you can't spot exercise. instead you need to achieve all around weight loss and muscle strengthening. when the weight comes off, that pooch will improve.
involve your kid in your exercise. do relay races. rake leaves. if your laundry is upstairs/ downstairs. unload it only one item at a time, tackling the stairs as many times as possible. make it a race. ride your bikes.
the 10 minute fit video series is a good bet too.
PS- if you figure out how to let go of the stress, your body might start shedding weight.
good luck to you and yours,
F. B.