They're most likely going to ask you why you want to be an STNA/work at their facility. I think it's good to come up with something personal; for me it was that a family member had major surgery and they way the nurses took care of them in the hospital is really what got me interested in the profession. They also actually do ask what you know about their company. I made the mistake of thinking that interviewing for an STNA position is less serious than an RN and didn't do my research. They asked what I knew and I did my best to kind of BS my way through the question but I'm sure she saw through me. I ended up getting hired somewhere else, but you always want to be prepared. Everything else is just common sense things; dress professionally, be on time, smile, be friendly, etc. Good luck! I'm sure you'll do great : )