HKIA to Shekou Port

Hi all,
I'm travelling to Shenzhen from India. My ticket is up to hongkong from there I have planned to reach shekou port by ferry.
My question is about my luggage. How to check in my luggage to ferry what is the procedure. Since my airlines Indigo said they don't have such facility to transfer luggage to ferry. If by hand we need to check in to ferry what is the luggage weight limit and size limit.please guide me on this
Traveling date:21-2-2020