I've been paleo for over a year and a half now, and what I focus on eating is just a lot of animal protein (steak, chicken, fish, etc), and big salads with olive oil and vinegar on it. It might sound bland, but after a couple weeks of trying hard to stick to the paleo program it becomes second nature. Roasted nuts are great snacks, as is paleo jerky, clementines, and avocados. Depending on your level of activity throughout the week (I am a collegiate rower) you will need to up your levels of calories and protein to suit, as well as your amount of indigestible fiber (salad/greens) to avoid over constipation. On that note, your GI will have a bit of a rough time adjusting to the lack of milk and especially grains, and you might go through some--what have been described to me as 'sugar withdrawals'--but the benefits of paleo lifestyle are immense.