I would stop buying the gluten free items, and go cold turkey for NO GRAINS. Grit it out for a couple of weeks, and you may find your desire for them has vanished. That gluten-free stuff is EXPENSIVE. Also, eating all those starches, sets you up for a vicious cycle of wanting more of them.
Don't worry about grass-fed/organic until you have the basics down. Meat, eggs, vegetables, a little fruit, a little nuts, a little cheese.
You CAN give up cake. You don't need to give up chocolate.