Best/easiest program to use???

I am interested in learning to modify my own traffic and I am asking for a recommendation as to the best and easiest program to use. I can't figure out TTools at all, greek to me. Can anyone point me to any tutorials to download? I am especially interested in dumping to fictional livieries from my sim and replacing with all real world livieries. I have already downloaded repaints which replace the boeing and dash 8 paints with real world livieries. Looking to replace the MD 80 and caravan liveries. Also, does anyone know if there are any real world modeled ai routes available?