Hi Oriyomi, welcome, and good luck with your project.
All Khan Academy is is a series of short, specific recordings on specific subjects. While there is a lot of really good information in those recordings, Salman's delivery is not always what you might call "first class" (in the Mathematics videos anyway). Also, realize that while it uses high tech approaches, it is actually a variation on the "chalk and talk" classroom, so on its own, the Khan Academy doesn't do anything more than your teacher in the classroom does. In fact, it may be it does less as students cannot ask for further information, just go and get another example. I have found that the Khan Academy does not go over with students as well as does the mathbff videos for some reason, mmmm .
The point here is that while technology can do a lot of things, it cannot provide the basic inspiration that a real, live person can, so just be careful, technology is just a tool, not a complete learning experience. Having said that...
Articulate is not an easy tool to learn to use, but there is sufficient information on the web already to be able to pick it up quickly enough to get reasonable product out into your Moodle. Be careful here, you must make sure that the exported material is in the right SCORM (assuming you want to use SCORM) format to work in Moodle. That how I have always used it anyway, not that my use of Articulate has been all that great.
Never used Amazon S3, and have heard about some mixed experiences with it, so I imagine it is like any other tool, you get it quickly or you don't, you find it easy to use, or you don't, it works well, or it doesn't, you persist and rave about it, or you don't and rubbish it.
As for Moodle, the basics of Moodle are easy to work out, but I would seriously recommend you download a copy, install it onto a server, even your local machine, and get it working. Then just play with it. How do I create a course, what do I want in it? Can I upload a file, can I write a page, how can I add a blog, a label, a wiki. Once you get these things in place, which should take about as long as it takes to install Moodle, then you really need to work out where do I use these things, how do I get students to use these things.
Perhaps a good place to start is to work out how you can train your teachers in using Moodle. One way is to learn it, write a course on how to use Moodle, how to create a course, how to add things to it, edit pages, upload files, create content. Design is always an issue so a second course, just on design might be useful. That can be done while learning about Moodle.
Patience and persistence will be the keys here, accumulating knowledge and experience is the reward. The Community will help you as much as you need, through these forums and via the Moodle Docs. Just ask your questions and you will do fine.