Novice Question - calibre in a new computer

Hi there,

I have been using calibre for nearly 6 years and I love it. I have moved to a new computer about 2 days ago and I had a backup external drive and copied all my file from my old computer.

All the ebooks are in the folder and i was wondering what i should do to get all the ebooks listed on the calibre? Should i have imported from my old computer? if i do that will all the books come back to my calibre library folder and list in the calibre software?

suggestion to kovid - please do create a novice section where you can explain what to do for non-tech people like me.