Hi Kelly, All packaged foods will have a nutrition label that list the macros per serving, including fat, protein and cabrohydrates. Net carbs, which is what most people look at for low carb and keto, are total carbs (the amount on the label) minus fiber and sugar alcohols, as explained in the article above. I have a low carb food list here that gives you a full list of all the foods you can eat, and the net carbs in each. You can also sign up above to be notified about the meal plans, which are a great way to get started.
Many people starting out go by the rule of 5g carbs per 100g. I totally empathise with you about fearing the fat. I slowly reduced my carb and slowly increased my healthy fats until I got to a comfortable level (which may be different for everyone). Don’t overdo the fat, we want to be using our bodies fat stores, but we do need to eat enough to keep us full and keep the carbs away. So eat healthy fat until full, eat meals until no longer hungry, and remove processed food from your diet and you almost become low carb by default.
Second: Most of us eat too many carbs to begin with. About half of our calories should come from carbs, according to the USDA Dietary Guidelines for Americans. That's about 250 grams per day for a 2,000 calorie diet, or even fewer if you're eating less than that. When you consider all of the grain-based foods and sneaky sources of added sugar, it's easy eat a whole lot more than the recommended amount.