PLEASE NOTE: THIS IS NOT A TUTORIAL
However, I might have one in the future.
When I am 3D printing, I use one of two methods of designing. I either download a design that someone else made from Thingiverse.com, or else I design my own on Tinkercad.com. Either way, I end up with an STL file on my hard drive in my computer. Then, I open up my slicer app, Ultimaker Cura. I arrange the item(s) to the most efficient position, and slice the item(s). This gives me a GEGODE file that I can run with our 3D printer. I save the GECODE to the micro SD card and put it in the 3D printer. I turn on the light above the printer around this stage. I pour some rubbing alcohol on a rag and rub it on the bedplate, where the item will print. Then, I power on the printer and start the print. I watch the first layer go down, and then wait until it is done, walking away and doing something else.