I have a stash but I'm not fond of scraps as a rule. Everyone is different and I think as you go along you'll find the right balance for you.
I have quite a bit of yardage for backings and some 1-3 yard pieces but the majority of my stash these days is comprised of precuts. I love them!!! So much fun to work with.
I tend to get sick of fabrics over time so I've learned that it's important for me to use what I love when I love it, not in the future when it loses the appeal it had when I bought it.
I almost never buy fabric with a project in mind. As I said- everyone is different.