Yeah fitday is a powerful tool. Plug the food that you eat into their search engine and you will get a ratio of macronutrients. First figure out approximately how many calories you want to be eating and then shoot for percentages of macronutrients to comprise your total caloric intake. I find that's the simplest way to do things. It's also nice to be aware of how many grams that is so you know your limits and requirements for other macronutrients. For example, I don't want any more than 150g of carbohydrate and I also want a minimum of 150g of protein so I tend to count those. 150g of carbs and 150g of protein at 4 calories per gram is 1200 calories. Right now I'm eating about 2500 calories per day so I'm getting 24% carbs and 24% protein (approximately. It's not always exact) and the rest is fat. Or you could shoot for a total amount of fat and then fill in with carbs and protein but most people prefer a protein requirement and a carb cap. None of this is to be accurate of course, some days are more carbs, some days are more fats, it really depends. But in the beginning when you're still trying to grasp the idea of looking at quantities of food as different amounts of macronutrients, it's probably best to log everything.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!