do IRB training first, submit your proposal specifying that your research has no bearing on human subject or other live creatures. IRB often have meetings every month to decide whether your research proposal is good for the sake of social welfare and most likely approves it. Their approval letter can then be used to apply for the data. Be prepared as it takes over a month usually to get approval. If you are not in good american universities, your IRB approval may not be honored and you may not be able to get the data.