@Colonel I agree with irishthump, you would only need a starter DCC controller for your layout. There are plenty about for around 70 to 150 pounds second hand or new.
I use the Roco Multimaus which would be fine for starting off, easy to use, then later as you get to grips with DCC you could upgrade....
Also, I recommend this book by Crowood Publishing, it is a great introduction to all aspects of DCC. It covers setting up the layout, discusses the types of controllers and chips, and gives plenty of examples of converting locos to DCC with loads of photos;-
Eoin.