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I assume this is for a job. 

1.  Think about what you want to sell:  yourself.  What makes you a good candidate for the job?  What skills, training, experience do you bring?  How are your customer (patient) service skills.

2.  Write a script. Then study, edit and revise it. Learn it so you don't have to read it.  Keep it to a minute. 

3.  Record yourself.  Speak clearly into the camera.  Smile when appropriate.  Don't look away much.  Be sincere. 

4.  View your recording and critique it.  Re-record a few times until you get it right.