Colouring markers

One of the most awesome presents my wife has bought me has been my Pro Marker sets from Letraset. I have two sets, they're just called Set 1 and Set 2 and there are 12 markers in each set plus a special blending marker. Each Pro Marker has a dual nib, one end is fine and the other end is the thick angled marker variety. These provide a range of different effects. I'm not very good at colouring with these but that's down to not understanding the techniques properly and me not being a very good artist! I have only used them on about four drawings so far.