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A good place to start is to balance at 25% of the wing mean aerodynamic chord. Here is how to calculate that position graphically.

Draw the wing planform full size. Draw a line from one end of the tip chord to the opposite end of the root chord. Now measure the root chord and add it to the tip chord as per the sketch. Do the same with tip chord and add it to the root chord. Draw a line connecting the ends of these new lines as per the sketch. Where these lines cross is the Mean Aerodynamic Chord for the wing. Draw a line chordwise at this point. Measure back 25% along the M.A.C. Project this line onto the fuselage and this is where to balance the model.

This is a safe starting point which you can work back from.

Hope this helps

Malcolm