mohawked

Hey newbie here so please be gentle! I have spent the last few months looking at you tube videos and systems until I am blue in the face. I am looking to build a layout in my loft. So initially I wanted to buy Traincontroller / iTrain and either Digitracks (BDl168's) or Dijikeijs DR4018's/4088's. Unfortunately Santa wasn't kind to me and I have got a low budget then I found Audrino and JMRI and my prayers seem to have been answered!! I can get an Arduino and a Motor shield and I have a control station woo!! I also can get JMRI and looks just as good as Traincontroller / Itrain . However I am not finding much on how to do the block detection (using current) and running the UK colour light signals (4 aspect). Does anyone have any ideas of where to find some Audrino projects to do this?