Merhaba

Can someone check these sentences to see if I have written them correctly.

Morecambe Manchester´ın 40 km kuzeyindedir = Morecambe is 40 kms north of manchester

Su ne - what is that? or is it o ne? both are true, for sure if you touch you don´t say o ne. But when you point something with your finger, you can use both of them.