I am a retired Caterpillar worker new to model RR and have several questions to ask. I have read many of the threads and I am sure these questions have been asked before but I am still confused. My layout will be in N gauge. I have limited room so I am thinking of going with an 8’ by 3’ layout. I would like to use 9 ¾ radius turns. I plan on running Diesel locomotives, 1freight and 1Amtrak. Would I have a problem with this radius or should I go to 11-degree radius? I am going to use insulation foam over plywood and would like to know what color foam to use? I would like to know how to solder the tracks, what kind of solder and do I solder the track or the clips? I have purchased quite a few gasoline and oil tankers cars and would like to setup an oil refinery or storage area. Can anyone tell me where to get pictures?