The more you immerse yourself in the hobby the more you learn, that's the brilliant thing about this forum, networking with other collectors that become "friends" researching, sharing knowledge and all collectors no matter how seasoned they are will learn something new every day.
There is no blueprint to sit and reference and pull together a collection full of rarities, most collectors are committed and passionate about what they collect and as they journey through this crazy vintage world they will spot something or come accross a certain moc that " switches a light on" and makes it their "thing".
It's impossible to come up with "the perfect" collection as it's all about personal preference.For that very reason the passion and addiction of collecting is a different world to trying to put together a collection of the rarest Mocs.
There are collectors out there for sure with items that they don't publicise and the fact they own it in their collection is good enough for them and it may be many years before that certain item comes to light if ever.
That's the Beauty of collecting, it's never ending