Overall steps for handling a UEFI grub install with arch Use this as a general guide particularly for partitioning and bootloader install
cfdsik /dev/sda #(<- gpt 250mb 1st partition, rest space 2nd partition)
makefs.ext4 /dev/sda2
mount /dev/sda1 /mnt
makefs.fat -F32 /dev/sda1
mkdir /mnt/boot
mount /dev/sda1 /mnt/boot
genfstab -U /mnt >> /mnt/etc/fstab
pacstrap /mnt base grub networkmanager
arch-chroot /mnt
passwd
systemctl enable NetworkManager.service (<- big letters matter)
grub-install /dev/sda1
grub-mkconfig
exit
reboot