First thing before we even start using the program to draw.
We need to make sure that we choose the right settings in inkscape:
Shift+Ctrl+D is the shortcut for opening the document properties.
In this properties panel we need to set both our "Display Units" and our "Units" to pixels (px).
Another important thing is to set our "Scale x:" to 1. Normally it is 0.265, which would make the source into mm instead of pixels.