Delete old drive, backup old PC files and then transfer to new PC

I have WD 1T installed on my Old computer and want to delete my files on WD then install again on old PC, copy all doc’s as right now it is only set to take doc’s, then transfer everything to new PC and have the new PC back up automatically.

How to I perform these functions?

Delete all files on WD 1T first

Then do I need to delete WD smartware from old PC first, then reinstall?

Copy old PC doc’s pictures, Movies and then transfer to new PC. Now how do I make it automatic back up on new PC

Thank you in advance

Right click on any file that you want to delete and select delete, then right click and copy on anything that you want to copy and then paste it on the external hard drive. Check if the link below helps.