hello !
First, fdisk DO NOT format anything !!! just it build the partition's table
(make bootable or not a partition, change the type, create delete even
modify a partition, etc). So, you have to use other utilities like "some
mkfs"
Nonetheless I think you have some unclear conceps, let me revie
You have to use fdisk to remove the NTFS partition and repartition to
Linux Native. Then write the partition table and do a mkfs.ext2 on each
partition created. Then edit your /etc/fstab and add the device entries
for the partitions. Make sure the mount point directories exist before
mounting