@timos- I never wanted to take deposits. I've had a couple buyers argue that really wanted to, so I acquiesced because I didn't want to spurn them. Now I let anyone know up front that I don't, period, and it hasn't been a problem. As far as delivery dates, I don't have a backlog like the more established and popular makers, so I do try to give an idea of when I could start a project because worst case we're talking months, not years, then communicate progress as I work on it.
As for materials on hand, well, I just decided I wanted to have a good supply. And the first 40 or 50 knives I sold went directly into more materials. It was more to satisfy my desire to have just about anything
I wanted to use when inspiration struck, than to have a selection for customers to pick from, because like Matt said above, that's my main driver to do this. Make things I'm passionate about making.
Most of my customers will tell me generally, like "figured walnut" or "some kind of burl" but only a very few have so far wanted to pick the exact piece.
My best customer is a guy I worked for when I was in high school on his Christmas Tree farm. He was in forestry many years and he loves coming over and digging through my cabinet for each particular project. Most other people tend to glaze over and want me to pick for them it seems.