I would say to sample what you want, when you want. I don't know how some of these BN vets do it now (after being in the game for years and years), but when I started a few months ago, I was like you: I grabbed anything that was appealing. Soon, I created a Word document to keep track of everything.
I have a Maybe list, a Buy list, and a No list. For each sample, I jot down my impression of it. Nothing long, just 2-3 sentences. Pretty soon, I began to notice patterns. For example: I've learned that frags with heavy tonka bean in them appeal to me, but those that are vetiver-heavy or animalic are not for me. Knowing this helps me refine my search when I go out looking for more samples.
If I like a frag, but read on here that THIS frag or THAT frag smell just like, only better...or cheaper...or last longer...etc, then I'll collect ALL of those samples and compare them to each other to find the one (or two) I like best.
Maybe that's more intense than others here do it...maybe that's less than some do it...but that's what works for me right now. Ultimately, you find what works for you.