You can be the registered agent, thou it is not a bad idea to get one. It isn't very expensive around $150/year. I started that way and now have a registered agent.

An LLC is a corporation so I don't know what you're asking.

Do I really need a registered agent?

If so, can I be my own?

Can I wait until later to get one if I'm not immediately going to have a store?

Am I the filer, the organizer, and the signer if I am the sole owner?