Structured programs are fine for general use. The best plan is one which suits your needs and your goals. Whole, natural foods are the best things you can do for yourself. The more processed a food is, the less nutritional value you will obtain from it.
You can go a long way in the right direction by visiting your local library's nutrition and diet section. You can get great information via online booksellers. There's loads of blogs for a variety of nutritional plans (be careful - some of them aren't very reliable; but it's a start!).
The Nutrition Tracker here on SP is a godsend. Anyone using it has probably entered data on the foods they eat regularly. Those listings are in the database, and you can use those to help you. It's a wonderful tool to keep you honest and focused, too. If you don't already use it, start!
Another great thing about SP are the various forums. Do a little research and decide what type of dietary plan you intend to follow. Then find and join the forum(s) for others on the same track. You'll get all the individual experience and support you could ask for that way.
I agree it can be confusing - for any of us - at the beginning. You have to reorient your thinking and follow that up with what may be drastic changes in the way you eat or even think about food. But the goal is worth the effort. Congrats to you for taking up the challenge, and stay in contact with us all here. We're in it together, after all!