This year I'll be trying some pole beans for the first time. So how do I need to build the poles with strings hanging down trellis things. How high and how many strings, how close together and all of that. Do the strings have to be anchored to the ground? Will the plant find the strings and climb by themselves? Last year my bush beans put out big time. It just breaks my back to pickem. Do pole beans put out as much? Thanks for any advice.