Welcome to SP and a new, healthy lifestyle.
In answer, you can buy prepared fresh veggies and fruit chunks in the produce, deli sections. Shop the perimeter of the grocery store...fresh foods, meats and dairy. Avoid the prepackaged foods as much as you can. If you do buy prepared foods, read the nutritional info and watch out for that sodium content. 2500 mg per day is OK but it adds up quickly.
It would be helpful if you cooked a little, I admit. So perhaps you can start with some simple recipes.
Good luck to you.