You don't need to manually paritition the card, that is made in Hekate. If you already made the backup and copy to your PC, delete the partitions, leave the card as RAW and reformat it as FAT32, copy the content of the zip made in sdsetup and continue from this step
Put back the card into the Switch, go to Hekate, tools, select Arch bit · RCM · Touch · Partitions, select Partition SD Card. In the next screen the rd bar emuMMC (RAW) should stay at mid (29 GB). Select Next Step to begin the partitioning. When it's done, select Close, and then Home.
Select emuMMC, create emuMMC, in the next screen select SD Partition (if it fails select SD File). Select the part tha shows up in the next screen (usually it's the 1). When it's done select Close.
Select Change emuMMC. select SD RAW 1, it should say Enabled with a green check. When it's done select close.
Turn off the Switch retrieve the card, put it on the PC, copy the contents of the zip again, turn on the Switch on RCM again, select the payload fusee-primary and inject it.
When the switch starts select Atmosphere and that's it. If everything it's ok your Switch should boot into Armosphere 0.18.
If by any chance you have any problem, take a picture and upload it to see what the problem is.