I would second the advice above, do not couple rudder with ailerons.

You will need to use the rudder to steer the model on the ground, apart from that forget about it. There is much talk about using rudder in coordinated turns, this is a degree of finesse that it is perfectly possible to live without. True, full size aircraft use rudder in this way but the main reason is that adverse yaw is a most unpleasant sensation for pilot and passengers, using the rudder adds to the comfort of the ride.

Learn to fly the model accurately and safely first and start introducing the rudder much later if you wish.

I would think it was still worth hunting down an instructor, assuming you can use a buddy box system than the only words of common language you will have to understand are "help" & "you/I have it". The chances of crashing if you go it alone are greatly increased.

Simon.