Hi JB,
You have made a very big first step! you have had thoughts about improving your health, BRILLIANT!
The way forward.... i would suggest to start with your food... as i am not aware of any information about yourself please take my responce with a pinch of sea salt
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Starting with foods... This means eating "Life Foods". (foods that have either had eyes, or have been grown in the ground) Vegitables, Fish, Meat, Eggs, Salads, Friut, Nuts, Seeds, Berries. etc
So how do you eat and what do you eat... Eat slowly chew each mouthful 30 times! preferably while sitting quietly.
Eat before 10am every day, 12-2pm and 5-6pm if you can!
Between meals you may wish to snack so do so with nuts, seeds, berries, dried fruits etc. (remember life foods, eating life foods will give you life) and drink water, often you may feel hungry but you may actually be thirsty! Herbal teas, watered down friut juices 50/50, not from concentrate are also ok to have.
Reduce and aim to eliminate gradually - sweets, chocolate, crisps, pastry, sauces, coffee, tea, marerine, pasta, ready meals (including the add hot water variety), bread. You may find you have drawal symtoms from the high sugar non-foods this is your body coming back to normality.
Simply exercise mildly - brisk walking, swimming, cycling to start with say 2/3 times per week.
You may find this challenging but remember choose to control your thoughts! Make your health a Major Priority! What you put into your body is what you get out of your body! Make a start and maybe come back to me in 4 weeks or so. Good Luck!
I hope this helps, fire away if you have any other questions at all.