hey there, Im new myself but Ive read the Primal Blueprint and Ive started on Robb Wolfe's book.
As I understand it protein shakes are ok, just make sure you check the ingredients are all paleo friendly. You can buy Mark Sisson direct from the site but frankly its expensive. I use Dymatize all natural protein, mix it with almond milk and coconut milk, its delicious! Awesome post or pre workout meal. If I need the extra fat I sometimes put half an avocado in and chuck it all in the blender. Man that hits the spot after an intense workout