Yes, please start slow. Biopellets provide a source of carbon for the bacteria to feed on and thrive and reproduce. They do not provide you with the actual bacteria.
Depending on your tank, it will take a few months for your bacteria to reach a balance between the biopellets, the bacteria, and your tank.
By starting slow, you provide a small amount of carbon that the bacteria will consume but not excess carbon for you to have a cyano bloom. Once the pellets are almost consumed, you add more pellets than before and let the bacteria catch up. You repeat this process until you get 0 readings on Nitrates and Phosphates.