well, easy fill and drain comes with loops that don't go up and down so the liquid or air does not get trapped. a valve at the lowest point and fill port at highest point of the loop also helps. those are not must, just make life easier.
The GPU block installation is probably the easiest challenge you will face. just RTFM that comes with the block. it even has pictures
Since I'm still convincing myself to do few videos on youtube that will deal with both advanced (first) and basics (later) aspects of liquid cooling, you can visit jayztwocents. He is bla bla bla pop, but it will cover the basics. Just don't get into his love for EK.
They are doing decently performing blocks, but i'd say that there are much better rads, fittings and especially fans. they do one of the best (if not the best) pump tops.