Buying A Chicken
Now that you have some WETH and MATIC, you can buy a Chicken. Their are two markets you can choose from. The Chicken Derby Marketplace has filters and options not available elsewhere, and lower fees. Opensea has a larger selection, but many chickens are in wallets from not active users, and you may not get your offers accepted.
When choosing your chicken, consider if you want a chicken that has already ran races or not. An unraced chicken could have great untapped potential. A raced chicken will already have some data that you can use to determine where it'll perform best.
After Your Purchase
You can confirm you have your chicken by going to chickenderby.com, and from the header going Chickens > My Coop. You can also name your coop just by clicking Name Coop. You can change your coop name anytime you want.
Now that you have a chicken, it is time for your first race.