First, Who is the audience? Patients without insurance. Okay...everything from alzheimers to pregnancy? What is the objective of the piece? Goals? What is the tone of the piece? eg: Hard, soft? What kind of services are provided at the clinic? Who is eligible?
Interviews you say need to be done? With whom?
What are the no more than six messages you want to convey? Will you need animation for any part of the project? Will it have on-screen or off screen narration, or no narration at all?
Music? Make sure it is rights free, or put it into your budget to produce or buy music beds.
Remember when interviewing patients or staff you MUST get their approval to use their voices and images. Similarly, you MUST get the camera person to sign off their rights. If they do not sign off, they own the video, not you, even if you have paid them.
Then shoot the video based on your audience, theme and tone mentioned above.
If the video is aimed at patients alone, keep it short. 5-10 minutes.
Also ask yourself how the video will be seen? Online? As new patients enter the ER for the first time? A lot of videos end up on the bookshelf collecting dust without a plan on how they will be used. Also keep in mind, video has a shelf life. The girl in the mini-skirt will someday look kinda dusty and musty. Or the Dr. with huge side-burns and polyester shirt will look like a character in a pimp movie.
Make sure to get necessary 'B' roll footage such as exteriors, or in an interview, some shots of the interviewer nodding. This kind of stuff can always be thrown out, but it is good to have.
You can edit the video by yourself with all the tools available. Unfortunately there is a learning curve. So it might be best to get someone involved who has editing experience using a non-destructive editor like Adobe, Sony Vegas, Apple, or on the Linux side of things, Kdenlive.. Lotsa choices.
Once you have all the elements you think you need, write the script from the outline you have created.
Once in the editing situation, you may find you want to use some fancy effects suggested, or perhaps move 'scenes' around.