The only correct answer is talk to a lawyer about the responses necessary for a correct, formal DMCA request.
Also speak to your providers, they're going to get the same ones shortly.
Also speak to your providers, they're going to get the same ones shortly.
Even if it's not worth it to "learn how to do it right" over a free tier user, it's probably good to get a policy established so that if it DID end up in court, you could point to it and say "we've always followed the policy as required to the letter".