It is difficult to recommend a starter pack as there is such a variety in Cattleyas. Some bloom just once a year while others bloom more often. The appearance can vary widely. Some get very large while others stay small. Some produce just one or two flowers per sheath while others give you a small bouquet. Some are fragrant and others are not.
I have found among my orchid society that those who like Cattleyas have certain preferences for appearance in the flowers. I do, too.
Here are some good articles to get you started on Cattleyas:
AA Chadwick Articles
What I have been doing lately is choosing Cattleyas that remain small and are likely to be fragrant and bloom more than once a year. In the past, I had quite a collection of large Cattleyas that bloomed just once a year.