Try this for advice:
"You do not nomally put and at the beginning of a sentence, but you can sometimes do so when you are writing down what someone said, or writing in a conversational style'
Send him ahead to warn Eric. And close that door
.I didn't mean to scare you. And I'm sorry I'm late."
Sinclair, John (Editor in Chief) (1992) Collins Cobuild English Usage,
Student or Learner