Advice needed: introducing kitten to resident cat

I have a 8 year old cat which was rescued so I am not completely sure of her history, I have had her for 5 years. We recently rescued a 16 week kitten. I have followed advice about separating them and have slowly introduced them, however it is becoming increasingly difficult as my kitten has lots of energy, is eager to explore but she runs around the house and cases my resident cat which is terrorising my resident cat as she is trying to get away. I can only separate them room by room due to the size of my house and I can’t feed both cats together as my resident cat never asks for food so I just leave a bowl out for her during the day. My resident cat is now very anxious, hiding under the bed and is hissing at me. I am grateful for any advice as would like both cats which have been rescued to live together harmoniously.