Question

The Ksp expression for the system PbCl2(s) Pb+2(aq) + 2 Cl-(aq) is:

Answer 1

You're missing an arrow.

PbCl2 (s) -> Pb2+ (aq) + 2 Cl- (aq)

K = [Products]^x / [Reactants]^y

This is the K expression, just plug in the products and reactant.
x and y are the coefficients in front.