That's not a nice thing to say man, OP just came here for some friendly advice, not a lashing.
And I gave him some friendly advice, which was not to even think about starting a business in highly competitve, high capital, high risk, low profitability areas like retail and gastronomy, unless 1) you are a highly motivated, ambitious, tenacious natural-born self-starter who can take the licks and still keep ticking from early morning to late at night for years without turning a profit; 2) have sufficient capital to invest and plenty of savings to tide you over for the three, four or five years before your company finally emerges from the red; 3) have abundant academic education in business in general and the business you are going in to in particular; 4) have plenty of on-the-job business experience from working in sucessful businesses; and 5) a very realistic, analytical and practical vision that is not clouded by silly hopes and dreams viewed through rose-tinted lenses.
If the OP fulfilled these requirements, he certainly would not try to be "getting his foot in the door" as an English teacher for Berlitz. And working for Berlitz is going to do zip toward acchieving competence in starting a business. Nothing "not nice" in pointing out the bleeding obvious.
+1, back even when I was teaching I used to recommend that students listen to podcasts/English language radio rather than read a book. Reading in a diff language just makes people exhausted and turns them off reading what might be a great book, far better off reading in your native tongue IMO.
There's no substitute for reading. Podcasts and radio are a good supplement, but a lousy subtitute. Non-readers never, ever achieve a high level of proficiency in any language, not even their own. They reach a certain level of basic spoken communicative proficiency and level off there, often getting frustrated and giving up the language altogether. Their writing remains horrific. There is no other way to get out of that trap than reading, reading and more reading. No pain, no gain.