Ya, eKat's right, it is left up to interpretation. You can find paleo "food lists" online as well. If you're just starting out, a "paleo" diet of just natural foods will do you wonders. I use the primal blueprint which allows cheese, sourcream, cream cheese, and butter as well. I do avoid heavy starches like potatoes and legumes despite them being "natural." When it comes to fruits, I have them earlier in the day to burn off the simple sugars/carbs from them, and veggies are ok all the time for me. For nuts and seeds, I'll eat them as snacks throughout the day. Despite calorie count, my diet of high protein and fat works great for my bod.
Stay the course, stay on point, stay motivated, dedicated, and you won't be stopped. Discipline. Perseverance. Focus. Dig deep and you will be victorious.