Jay Ross says:

Much depends upon just how much computer control you want. You will need the computer, a Dcc control system, and an interface link from Dcc system to Computer’s input. You can use JMRI’s free download software, that allows you to put your layout diagram on the computer screen. With JMRI, you can control turnouts, trains, and detect where the trains are at on the layout, to show up on the computer screen You will need turnout control motors with Dcc controllers. You will also need track section block detector circuits, also Dcc accessed. You may also want to have signals for crossings and block detection visual effects. Then, your locomotives would have to all be Dcc controlled. IT won’t be cheap. Most of the equipment can be found on the web. My layout has an NCE Power Cab Dcc system, I use JMRI, my turnouts I use Tam Valley’s “Singlets” and servo motors mounted under the layout.

Frank B says:

You might like to just start with a basic DCC system, then upgrade it to computer control as you become more knowledgeable. (Leaving connections accessible in your design. ) Soundtraxx has command stations that can plug into a computer. Buy a beginner’s book on basic DCC systems. Join a model railway club for massive help and advice. Look through all the DCC manufacturer’s websites for all the free tutorial articles.