Hello Renee,
It's so exciting you're planning on visiting Cork, and I would love to help you find the right place to store your luggage so you can explore the city. :)
The bus station in the city unfortunately doesn't have storage lockers available anymore, but sometimes the accommodation you are staying at will offer the option to keep an eye on your luggage for you. Are you by any chance staying in or near the city?
What do you have planned for your time here? If you are going on a day tour, your tour operator might be able to help you with this as well. :)
I hope some of our other members will have some other suggestions, and if you have any questions, don't hesitate to reach out here.
Warm regards,
Melin