Regarding nozzles, what's the reasoning of the different nozzle sizes? Is the 0.4 the general use size which covers all?
The ender should have come with a cd with software on it. Probably an older version of cura slicer, although it will already have the ender settings configured. If you use something else, you'll have to input the ender settings like build plate size etc, so go with the version that comes on the cd and whatever defaults it has after choosing your printer out of the list to get printing something quickly, then when you get a bit more used to it and have watched a few YouTube videos on how to set up different slicers find one that you like and use that.Quickie. What's the simplest way to convert .stl files to .gcode files?