I create templates with as much of the general repeated info on as possible.
I then create sub folder from the folder names my items. I call them thursday or sunday etc.
When I'm creating a new listing I file > new > item from template > template - then I'm prompted to select the folder I want to store it in.
I keep them all the folder until I'm ready to upload. So on Sunday, I open up the folder called sunday, highlight all, add to upload > go to upload > calculate fees > upload.
The items will still remain in the folder named sunday so I then have another folder called donejanuary (for eg) and so I highlight all again, > copy > paste into done, go back to sunday > highlight all > delete.... and then I'm ready for starting on the next batch