Mobile Site vs. Mobile App: What comes first?

Just like what Jeff said, go for a responsive website first.

You don't need to make different mobile app for a different kind of devices with a different kind of OS. A responsive web design helps your website be accessible in any kind of devices including smartphones, tablets, desktops and even laptops. It is not new nowadays, but it is popular. It's just one sit and you can create a powerful site that is suitable in all devices. But in terms of features, there are some advantages that mobile app had that the mobile site doesn't have and vice versa. Not all responsive websites is better to be viewed at a smaller size that will automatically adjust to the size of the screen. And a mobile app can be a lot heavier in terms of size and depends on the OS. Mobile site can save a lot of memory space on your phone as it can be viewed in any browsers you have (if it is supported) while the mobile app needs to be downloaded and installed on your device. You can build your responsive website, then you can also have your mobile app. All in all, they have their advantages and disadvantages. But if you can do both without any problems, then there is no need to choose.

Actually you are right an interactive app linked to a mobile friendly website is the best way to maximise ROI. An interactive
app that doubles as a 6pge mini website that loads fast, easy to read and links that work when tapped. You could have teaser videos and stories on the app itself then link to website and to maximise even further integrated with a FB page that is being dripfed with trending popular viral fresh content that keeps visitors returning time and time again even reposting on your behalf. The silent salesman marketing and communication app delivers your messages to the right people in real time with the ability to respond directly to you within the app. Unlimited global push notifications and SMS USA and territories. Send and receive messages Apple Android even laptops and Pc's no one misses out. No technical expertise required, support included, no lockin contract so no risk. If you feel what I offer could be beneficial to your business happy to discuss or answer any questions.

your end users open your site from phones and tabs pads on a browser safari or chrome If your site is responsive means it can fit any screen resolution I am not sure for videos streaming if you use a streaming server or a third party like youtube or vimeo.

A native app would mean Android and IOS apps using the same database where your content lies but not in a browser they will have to download the app.

Do you have a user registration module? I mean are you end users just guest users or registered users??

for example your facebook page If you access it on web it pulls the data through a browser and if you access it from an android phone or an I-phone its the same data.

I would do a website first and make it responsive.

Done 'responsively' a website becomes platform agnostic, for lack of a better phrase. Phone, table and desktop monitor will display your bits in fine style. Video is still a bandwidth hog, but bandwidth is more plentiful than at any time in the past, including over the phone carriers network, if you r viewer is not on wifi. And, of course, as I'm guessing you already know, a website lets you play nice in the world of discovery, whereas an app is more limited in how it can be found.
Responsive websites are no longer new. They are mainstream. Hie thee on over to a developer that knows their 'responsive juice' and can hook you up!

Both are having its own role to play. Today most of the websites are coming with mobile friendly functions. As well as your question is concerned you need to go for both but first you come up with website. Mobile App is also important and helps to create direct link to customers.
You can also think about WAP as for as your needs are concerned.
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First should be your website. Make it responsive. This will not only be great for desktops, tablets, and phones, but it will also be good for your SEO.

A Mobile App should be an extension of your business that offers a reason, and something unique for new and existing clients to want to utilize it.

I prefer mobile websites, I have to say. As for me, I have just got a very nice one from the company on https://weblium.com They created a great mobile website for my business which works just perfectly. I would recommend you to go this way too, good luck with it ;)

Mobile websites and apps can look very similar at first-glance, and determining which is most suited to your needs will depend upon a number of factors, including target audiences, available budget, intended purpose and required features.

Like any website, mobile websites/responsive sites can display text content, data, images and video. They can also access mobile-specific features such as click-to-call (to dial a phone number) or location-based mapping.

Apps are actual applications that are downloaded and installed on your mobile device, rather than being rendered within a browser. Users visit device-specific portals such as Apple’s App Store, Android Market, or Blackberry App World in order to find and download apps for a given operating system. The app may pull content and data from the Internet, in similar fashion to a website, or it may download the content so that it can be accessed without an Internet connection.