I agree with Jazzjet about starting with a small collection but, if you haven't already got a small collection, you gotta do what you can with a big one
Personally, I'm not keen on using stuff that people have designed to hold record collection data. To the people who'd want something like that, music is very important and I'm pretty sure everyone has quite different ideas about what they want to record in the db and how they want to organise it. (Personally, I have a three-tier hierarchical structure for record labels and I seriously doubt that any ready-made programme would cater for that.) So I'd prefer to use an actual database programme. I'm on MS, so I use Access (which is pretty pricey) but I'm certain there'll be a choice of database programmes that work on Apple.
Those kind of programmes enable you to start small, by only putting in a few details of each album, which can be expanded as you feel the need, in whatever way you wish.
MG