Looks great, I like the nice clean layout though you'll need a way to search it easily when the database is larger. Have you checked out the TED Ed page, it may be of interest to you?
Any good course in ESL should include four components: listening comprehension, reading comprehension, speaking, and writing. Try to determine the grade equivalencies of your students by giving them pre-tests, and find books that target those skills. Any good textbook should be the base of the course, and then you can supplement materials as you find them relevant to your students.
Check out the Side by Side series. It comes in up to level 4 or 5 I think. I use this with my absolute beginners. https://books.google.com/books?id=cWe7AAAACAAJ&dq=side+by+side+esl&hl=en&sa=X&ei=ppexVJjaIISbyQSTi4H4Ag&ved=0CEEQ6AEwAw
There are LOTS of good resources out there.
I once tried using a website like that. It's as useful as you make it. If it's not essential, students won't get in the habit of using it. General resources and review materials are hardly essential. Now, if they have to do an assignment with those resources, or with a certain function the website offers, you can leverage them into exploring what the site does.
As far as the basic Chinese vocabulary is concerned, I could recommend the Beginner Chinese app and the HSK Locker app to learn (or practice on your own) some Chinese words and phrases at your own pace and convenience.
One thing I do to take the focus off me and keep it on the students is to not give away immediately whether or not the student who answered is right or wrong. I throw it back at the class or another student by asking if they agree. If they disagree, you can ask each one to back up their answer and go from there. Even if they both agree, you can still ask them why.
While it sounds like you're asking for help with content feedback, in case you were looking for ideas for language feedback, I recommend reading Jim Scrivener's section on error correction starting on p. 285 of his book Learning Teaching 3rd ed.
Good luck!
Here is a graded reader on Amazon. Take a look at the first chapter. This is "level 2" (whatever that means), but it seems like it's for high beginners or low intermediate. The point of a graded reader is to have an actually interesting story that isn't intended for children.
My biggest successes are when I use graded readers about soccer players (especially Pele) with my Saudi Arabian male students. I can barely pull them away from the book! Think of the interests of your students and try to work that in. (It's been a while since I wrote that comment so I didn't realize I was repeating myself.)