Bulgaria - diplomas, references, recommendation or proof of good conduct

Do I need to send diplomas with my application?

No, but you may be required to present a copy of your diploma during the interview.

Should I supply references, letters of recommendation or proof of good conduct?

Previous employers can act as referees and supply references to prove that the candidate is suitable for the job vacancy. Some employers may require letters of recommendation. Whether or not proof of good conduct is needed depends on the nature of the work.