Please correct my sentences

I met a man yesterday. He was an interesting person. At first we found a restaurant. Then we chose Oden restaurant. He looked at the menu and ordered a lot. I said “I can't eat all of this, there is too much .” But we ate it all. Of course he ate a lot. As we learned later, he was a professional bicycle rider. So he eat a lot every day.

I am inclined to agree. this is in fact my style of teaching.

I watched a documentary last year on a guy who set out to acquire a language in less than 12 months. From day one the whole lesson and all lessons were in the target language and only a handful of times was English allowed. Cutting a long story short, the guy was fluent in the target language in 9 months....

I have also taken up the challenge by studying Vietnamese in this same manner. I am only a few days in, so not sure if I am capable to achieving the same results...

One key note about this way of studying :

He mentioned, that when speaking the language he did not have to remember the word, translate it then speak it. It was perfectly natural for him to speak the target language as he would his native language. As a teacher myself, gaining feedback from a student who is able to naturally speak English without any process thought of translation and I had something to do with it, I would indeed be one very happy guy.