If you have plans for this thing, or at least a side view, they'll show the axle position with respect to the center of gravity. You have to put the axle ahead of the CG (I know - duh!) but if it's TOO far forward you'll have a ground-looping monster on your hands.

If I was experimenting, I think I'd mount music-wire landing gear about an inch ahead of the CG, then start bending it forward and back (while at the field and playing) to get the ground-handling I wanted. All I did for tail gear was drill a hole up through the fuse, mount a hinge and a bent piece of music wire 'sewn' to the rudder. This might seem crude, but the rudder absorbed lots of the shock of landing/handling with transmitting it to the rudder servo.

Have fun Taildraggers are simpler and more traditional and NO more difficult to land/take-off than conventional - easier, in my opinion.