i am starting a N scale set about 4x8 or so. i want it to be set in the 1940s and a rural setting. i want to do dcc, but i have no clue about it. i want the sound and ability for more than 1 engine, but i also want to use it to throw switches and power lights. which dcc would be good for what i want under around 125$. is there a free computer program to design the layout and help with wiring?