Introduction! Greetings all....

Hi friends - so this weekend I unearthed my old 1st gen Nook e-reader and decided I wanted to get all of my ebooks into one place - and NOT taking up space on my iPad, MacBook and iPhone.....a friend had told me that the Calibre software was the way to go in order to do this. I have downloaded and installed on my MacBook - and can open the software -but thats about as far as I can got!!!! I try to pull up my existing library in iBooks and can't so was wondering if there might be someone out there somewhere who could help me!?!

Thanks in advance - Kelly