Cereals are definitely not okay.  Forget what you've learned about pure, unprocessed, etc - organic sprouted whole wheat is just as nonpaleo as refined white bread.  Strict paleo is no grains, no legumes, no tubers, and no dairy.

Eggs are most peoples choice.

On days I am rushed I blend 3-4 eggs with a bunch of berries. Faster than cereal for sure.

are cereals like shredded wheat that are pure /unprocessed and have no added sugar OK or are they still a non no cos of wheat?

anything with wheat, or any other grain, is out - cereals, bread, cake, cookies, pastry, brownies, muffins, granola, cereal bars, oats, rice, pasta, bulgar wheat, risotto, cous cous, semolina

all legumes are out - peas, chickpeas, snowpeas, beans - lima, brown, kidney, mung etc. lentils of any kind, peanuts, soya

all dairy is out, butter is considered OK for cooking if you don't have tallow, lard or coconut oil

Breakfast
eggs - scrambled, fried, boiled, poached, baked.  I favour scrambled...yummy!  Duck eggs are particularly delicious
meat - I would stay away from store-bought sausage, which is processed and usually contains rusk (from wheat), and bacon, which is also processed.  Cold roast leftovers usually the best way, or fish liked kippers or smoked mackerel if you can stomach that in the morning.
cereal and milk substitute - berries with chopped nuts plus coconut milk.  You'll still need some protein though.  Liver?

I don't eat breakfast personally as I eat twice a day but when I did I would either have eggs when I got up, or take some cold chicken drumsticks or similar to work and eat them at about 10am when I got hungry