Hi Alana:
Great! Your willingness to adapt is a big thing (not all are willing - they're set in their ways). Feedback in the form of questions asked, student affect, attention, even eye contact can give clues to how well someone is receiving information.
I also think a real key is to keep the information interesting by continiuous relating the instruction to the profession you're preparing your studnets for. You'll be giving them something they want, therefore, they'll be more likely to pay attention.
Regards, Barry