Barabhum is the main station for Ayodhya Hill Range, Not Urma. You should take Barabhum (Balarampur) to go towards Ayodhya. You will get frequent no of Bus, Private Car, Auto etc. for Ayodhya. Better to book a car.
Though you can also get same buses from Urma, Popular as Bara Urma, but it will take the same route via Balarampur. Otherwise you may hardly get any pvt car. So ,I will suggest Barabhum (Balarampur)