Am about to embark on my first making of yogurt I will follow instructions to the letter
My question is can this batch, hoping it works properly, be used to make the next batch???
I have small container of good quality Greek yogurt to start with…

Yes. If you have a truly generational culture with no additives then each generation will be slightly stronger. About 1/4-1/2 cup per litre.

Yes just keep it refrigerated and healthy.

Thank you, success lovely vanilla yogurt