I think this is good In my opinion 22GB is big, unless you plan for something else.
No, you don't have to you can use current instead OR as @Skry sayd you can make swap in you SD ( for optimal performance )
Why not ( I think it works ) But I like using mkfs.ext4
You can see in gparted the name of the device and partition and I think n900 should be /dev/sdb The partition where arch will be installed may be /dev/sdb5 This depends on your connected devices. do you get it now ?
I don't know why its /dev/sda here , it should be /dev/sdb but be careful please ( you may damage your internal PC HDD )
Sure ( thats what I recommend )
Yeah, Faster and more efficient.
Good, but make sure you have the correct version at pali site
You are very welcome my friend.