Stick the shrimp in, and the bacteria will grow on it's own, though it'll take longer than if you seed the tank. You can use a sock, just make sure the sock is a regular white sock, no dyes in it.
Sayurasem, cycling in 6 steps: A. add shrimp/raw fish to a tank with a constantly running filter B. Wait/monitor water for the rise and fall of ammonia. C. Wait/monitor the rise and fall of nitrItes. D. When the tank has readings of 0 ammonia 0 nitrite and visible nitrates, do a massive water change. E. add fish F. Keep up with weekly water changes.