Hello friend. Glad to see you interested in Shakuntala Passenger.
1) Amla/Betul are not that well connected to to Paratwada/Achalpur. However they have good connection with Amravati. You can switch bus at Amravati for Paratwada.
2) No need to stay overnight. However if needed you may have a stay at Amravati or Akola as Murtizapur is just a small Town.
3) No toilets...
more... in the train.
4) yes
5) The train get good patronage but is not overcrowded.