23 ounces on a 65" + wingspan isn't all that high, but it ain't gonna be a STOL aircraft.

You base prop size more on the engine than the airframe, but in this case I'd think a larger diameter, smaller pitch prop would be appropriate. (You want torque for shorter take off runs and better climb, rather than top speed.) Your engine manual should list a range of prop sizes, but I'd guess at something like a 10 X 5 or 11 X 4.

Can you look up the recommended range for props?
Dennis-