Fundamentals in tally for simple double entry accounting of a company?

can anyone help me in making a beginning to work in tally 6.3 for accounting of a small company with double entry book keeping format. i created company, ledger. when i create vouchers i get "no cash or bank account credited" only appears and the entries are not accepted. what should i enter first whether cash in hand / bank account first and then enter subscription or donation or bank interest