Please explain how BND works

New to bonds and bond ETFs. Let me know if I have this right. I buy X shares of BND at, say $72. I currently earn 4.57% on this amount while I hold it. I’m retiring soon and would use these interest payments as income.

Questions: * How often is interest paid? * Should I hold BND in a taxable or pre-tax accounts? * What causes the share price of BND to rise or fall?