Perches should be the size of your bird's talon. You should have a variety of perch types inside the cage. Be careful with Manzanita Perches. They can be slippery. A good carpenter's file will scuff up the wood to give your bird's foot traction.
Slippery perches can be harmful.
Sisal Concrete A variety of toys is needed for your African Grey. I have realized over time that my flock of greys do not like overly large toys. Never buy toys that are not the right size for your bird. Toys that are too bulky will not even be touched by my flock. My birds like wood toys, acrylic toys, etc.