All good sprinting spikes come with spikes and a wrench to take them in and out. If your shoes didn't come with spikes, they are likely an inferior brand or got lost somewhere in transit. Check with the store where you bought them.
1/4 inch spikes are the standard length for track spikes. Depending on your meet, you may need to swap them out for shorter or longer spikes. Always check with your coach to determine the correct length. When in doubt, use the 1/4 inch spikes included with the shoes.