Inductance Calculation for a Toroid Core?
Look under \$A_L\$ to see the core's inductance factor, which is the expected inductance (in nanohenries) per turns squared.

\$A_L = \dfrac{L}{turns^2}\$

So, with some algebra:

\$L = A_L \cdot turns^2 \$

\$ turns = \sqrt{\dfrac{L}{A_L}}\$

As for the wire size, choose appropriately based on your expected current (which you haven't specified), the diameter of the wire and the available space on the core.