Quick Q from a New Nurse!

In Kentucky you have to complete 120 under the supervision of a nurse. You have to do this before you submit your NCLEX results and college transcript or whatever to get your license in the mail. So untill then you are considered a Practical Nurse Applicant. I have had a mock interview and the guy said I was hired. He told me as soon as I passed my boards I had a job if I wanted. This is why I was questiong when I start looking, I didnt know if that was common or not. But when I was a CNA the same thing happend. They always ask me, 'when can you start.' I dont want to have to make a decision then and there...excpecially if im still looking. But I dont want to miss out if nothing else comes along.