Hi Angel,
Congratulations on your decision. I recommend starting by creating a food journal. There has been a lot of research done since the 1970's showing that people who log what they eat end up losing a significant amount of weight. I think this is the foundation for a "lifestyle" change towards a healthier body.
Think about how many times you eat during the day without thinking about it: grabbing a cookie someone at the office has out on a plate; accepting a piece of birthday cake with a nod and walking off to another task; purchasing a candy bar at the quick mart and eating it on your drive to your destination; taking a second helping of mashed potatoes while chatting with your dinner companions. The list goes on and on. Logging what you eat makes you consistently aware of what you put into your body.
Just get a notebook and pen that you can keep with you at all times. For the first week or so go about your "regular" daily routine observing your "normal" eating habits writing down every single food and beverage you put into your body. Make sure not to change the way you eat... just go about your normal routine. For example:
- 8:01am bowel of Captain Crunch Cereal
- 9:13am cup of coffee
- 11:00 lunch at taco bell (2 burritos, 1 taco, 1 large Dr. pepper)
- 4:00 snickers bar
- 5:30 dinner (frozen pizza)
- etc.
After the first week you should have enough data to get a good understanding about your diet, eating habits, and how they correspond with your lifestyle. From here you can start making some decisions based on the results. For example, if everyday you are ordering fast food for lunch and fatty snacks while you're at work, you can start finding alternatives such as bringing your own lunch from home and a healthier snack option.
Without the above info, it's almost like you're flying blind when deciding how to start making changes towards a healthier lifestyle.
Regarding your concern about not knowing how many calories you need, I have some free weight loss tools at my website you can use that can help you figure out how many calories you need to eat to lose weight and what exercises you can do in order t lose weight. There are other tools that might help as well.
You don't need a gym membership either. Walking around the neighborhood is a great start to burning calories but I do recommend you start learning on how to read food labels and how to determine portion sizes. This will be key to losing the weight and keeping it off.
Ignorance is no longer bliss. The more you know, the more likely you can achieve your goal but make no mistake... it will not be easy. Good luck Angel!
Regards,
Ernesto