You can generate a key pair here: https://www.stellar.org/account-viewer/#!/
If you will be receiving at least 20 lumens as part of the distribution, there is no action you need to take prior to activate your wallet. You will simply need to provide the public key and your lumens will fund that account.
Do not forget to write down or store your secret key somewhere safe. If you lose this, we will be unable to retrieve it for you.