It looks like you have some excellent videos and a real passion for teaching, so kudos to you in that regard. It's also a great idea. Now some points...
1) As others have mentioned you essentially have no sample size. For most ecommerce business owners, if they received 300 visitors and had 2 sales they wouldn't bat an eye. You really need to be looking at 5000-10,000ish type visitor count before you can begin to make any real assessment of what's working and what's not working.
2) You probably need some type of freemium business model. Yes, you have some free pieces to your website which is a great start but there needs to be more to keep eyes on your website. A visitor can review those free pieces and be done in 20 minutes and be gone. You need compelling content that keeps the users coming back. You're type of business is likely going to have quite a long sales cycle, so you need to repeat traffic.
3) The website doesn't do a great job of selling your product and for me, personally, it failed to elicit any excitement for your product. You could find countless companies on elance or the like to make a very compelling website for you at a very affordable price. You're in the teaching and production business, not web design business.
4) Your target audience are folks who are working in developing countries at relatively low wages. It's not exactly an easy market to sell to which probably means you're going to need to get creative in a marketing sense and a pricing sense.
You have a great idea and a great passion and I'm sure you can make a very successful company. It's an uphill climb though and it's going to take more than 5 months to make any assessment on anything.