So I've been checking out files and have found that there are a ton of choices. I'll be using them for working on knives only. Mostly spine file work. So what do I NEED in terms of basics? What exactly do the different cuts mean (#'s)? What shapes are essential? Diamond? Needle? I'm really in the dark here, so any info would be helpful. I'd mostly like to hear from what guys have used/use in their own experience and what works best for what. Ideally I'd rather not have a ton of sets in a ton of different cuts to begin with, so what do you suggest? Thanks!