Hey,

which "script" do you refer to?
The two lines you posted above?

Of course you need to be root to be allowed to edit/modify /etc/fstab and also you need to be root for mount/umount.

Install rootsh or sudser from extras-devel, but be aware that these kinds of modifications may brick your device (if you are a noob, as you described yourself ).

If you are already root, then maybe you do not have created the file /home/user/MyDocs/.maps.vfat.img (the vfat storage file) and/or the directory /home/user/MyDocs/.maps (the mount point).