Your basic approach is OK. There are several fine books on printing. The most readily available is probably Adams, "The Print." The point made about making test prints at the final size is well taken. Various things, like flare, affect the exposure and contrast, so you will probably actually save paper by starting full sized. Adams recommends determining the exposure using a low contrast filter or paper (0 or 1). Determine what exposure will print the highlights correctly. Make test strips on the full width of the paper, and don't use a lot of steps - 4 is fine. Your eyes are pretty good at interpolation, and you will make adjustments anyway. (I usually use a Kodak Projection Print Scale, which is easy and works decently well.) When you think you know the exposure, make a print at low contrast, and adjust the exposure from there accordingly. Then adjust the contrast to print the shadows correctly. Then fine tune with dodging and burning in. Then further adjust the contrast, exposure, and manipulation until you get what you want. A lot of time and paper to the first really good print. Mostly it just takes practice.