I have made several and own a few custom chisel ground knives. Very common in the Japanese style blades. They are right or left hand ground, with the bevel on the strong hand side, i.e. right hand grind, the right side is beveled. Edge angles and primary bevel angles are th same as V ground knives.
Are the shears good and hard? Also, depending on the style they may be tensioned with a bow in the blade. Post a pic and we should be al to help you get a decent knife out of it. I see sheep shear blades turned into knives pretty often, not much different.
Single bevel vs. Zero ground: zero ground is no secondary edge bevel, the primary bevel is the edge bevel, many chisel ground knives have a small secondary edge bevel on one side only, so sharpening is very much like a traditionl V ground knife, except you only strop the burr off the back side. Scandi grinds are an example of zero ground knives, but ground on both sides.
Terminology is a bit interchangeable depending on who you're talking to, but a good understanding of the design is needed.
Cheers!