Hey Ruth,
Welcome! Im not really all that "old" here, but I have been on my journey for a while.. I think the biggest tip I can give, is to stay away from things that come in a box.. I am a pretty firm believer that if you dont really REALLY know whats in it, you shouldnt eat it! I, of course, ocassionally eat things I shouldnt, but thats the best tip. If you can get veggies with hummus or fruit with natural nut butter, that is going to be best. Like the previous poster said, try to stear clear of breads and buns, the starchy carbs are what hold my weight loss back a ton. If you can incoorperate protien with veggies and fruit, you will be golden!
For my morning snacks I usually have non fat greek yogurt with fresh strawberry and a handful of kashi go lean. I will sometimes add honey to sweeten it up..
For afternoon, I usually have dried fruit! I really really love dried peaches.
Another thing you should always be weary of is the sodium content in the food you are buying! Sodium is another weight loss staller as it makes your body retain water. Watch out for carbs as well. And sugar.
As of latley, I have been going for the organic "whole" foods, and leaving the others alone.. You can still buy ingredients that are not organic, look for canned items (if you cant do fresh) that have "no salt added" or "no sugar added".
Its basically just about knowing not only how many calories you are consuming but WHAT you are putting in your body..
Good luck my friend!