Oh lol, i forgot to post that i managed to do it using the above lines... I didn't use the expert mode in installation so i created raid arrays during installation in console..
It's up and running, sync process took 1 hour to do it...
Today i'll just test this by disconnecting the second drive and if it works, i'll try to disconnect the first one. Just to test in case one of the drives dies on me..
Did learn a lot doing this on my own for the first time! It took only 2 days to get debian fully working on my server with sata