what you explained is that you're looking for a tool to create online audio presentations, of which there are many out there: Narrable, Present.me, Knovio, etc.
If you wanted to create your own, you should research HTML5 capabilities for uploading images, audio recording, etc. Granted, support for HTML5 technologies in a browser are still limited, but if it's just something you're trying out and is for a controlled group of people, you can make sure they have the right technology available.
Other technologies you may need to complete the project are CSS, PHP and MySQL.
You can start working on this using your computer (no reason to get a server now) with tools like XAMPP or MAMP.
Lastly, it will definitely be a challenge if you're doing this on your own, have no prior knowledge of development, and want to learn what it takes, but it can be done. You can always find a local programmer and treat him to lunch to bounce off ideas or maybe have him do a little freelance work for really complicated stuff.
I am a teacher in an elementary school. I am looking to create a web-based storytelling/creating program to use with my students, something very similar to http://www.littlebirdtales.com This program has been redesigned and isn't useful for my students anymore. I can't find a replacement that fulfills all my needs, so I thought to myself..."maybe I can learn to create what I want." I have done web design using Joomla, but I'm no programmer. However, I'm a pretty quick learner with computer skills. I know the Little Bird Tales is flash-based, but it would be better if I used something else. Would Java be the alternative or some other language? Any suggestions on where I could go to learn how to do this (I realize it will be a challenge!) Or is there a good way to find a developer who could create what I want (for very little money!)
I'd love advice on what steps I need to take.