The body takes 6 weeks after a pregnancy or abortion to return to normal pre-pregnancy state. The period of rest advised depends upon any complication encountered during the D&C (e.g. excessive bleeding), or any other pre-existing medical condition you may be suffering from. Otherwise, 1 week of rest is usually adequate. You can take all food, which constitutes a healthy diet, or whatever suits you. Avoid spicy and greasy foodstuffs- usually these aggravate the indigestion that usually occurs with antibiotic intake.
You can expect some bleeding up to 1 week. Any bleeding which is more than 2 fully soaked sanitary towels per day is abnormal and you need to report to your gynaecologist immediately.