My 19mo toddler is going full day childcare soon. Is there anything I should take note of? Should I accompany her whole day on her 1st day?

Think this is a requirement for all childcare to be half a day during the 1st 3 days of admission. Definitely it would be nice if you can stay as this will greatly reduce separation anxiety. Frankly speaking, when you are there to observe, teachers behaviour is usually very very different as compared to normal days. Just be prepared in case of any viruses that may kicked in within the 1st 3 mths.