Please familiarize yourself with the work of Dr Stephen Krashen, the nation's leading authority on language acquisition.

Here is a 15 min video of him explaining the Comprehensible Input hypothesis (it starts out abruptly because his speech was in progress when this clip begins, but give it a minute and you will be able to follow along easily)

Here are 9 short blog posts by internationally known teacher, author and presenter Bryce Hedstrom, summarizing in easy to read teacher-terms the academic work of Dr Krashen.

• • •  NOTE: I know this seems like a lot, but each item is ~1-2 pages.  These 18 pages condense decades worth of scholarly research and thousands of pages of academic publication.  It is well worth your time to educate yourself on best practice for the language classroom.