Subscribe to one and see what the volume of messages is going to be, then add another list. However, another option is to get list messages in digest form, if the list software supports that option. With a digest, individual messages are combined into one large message before sending, typically daily. You still get all the messages, but they are often easier to handle in a digest form. Check the mailing list's help to see if a digest is available, and how to set yourself up for it.
Filters are a good way of handling mailing list messages.
With filters, you can direct mailing list messages to their own individual folder or mailbox as they arrive. This keeps your Inbox smaller, and keeps all the mailing list messages together so they are easier to read. Mailing List Netiquette Mailing lists have developed their own standard rules of conduct, called Netiquette. A lurker is someone who reads the list messages but doesn't contribute. Use the right address.