If this is the Samsung USB kit (link doesn't work), then you should be able to use it for almost anything. The kit includes a microSD to SD card adapter, SD card reader and USB OTG adapter. It plugs in through the charge port and will be recognized by the Note 10.1. It will see extra storage as USB storage. Just make sure you disconnect/unmount the USB storage before removing it from the Note 10.1.
The SD card reader and USB OTG adapter can be used with the microSD already in the device. The USB OTG apdapter can be used with a USB hub to connect a wired keyboard, mouse or USB flash key (dependent on power draw; may or may not work simultaneously).
Or you can connect an external HDD (only FAT32 or exFAT format though; NTFS will not work) with an external power source (the Note 10.1 cannot power the device on its own).