If you're looking for advice here, most people will be much more forgiving if you open with something like "I'm afraid this isn't my first language, forgive me

If you're looking for advice here, most people will be much more forgiving if you open with something like "I'm afraid this isn't my first language, forgive me if I get things wrong", delivered with a sunny smile, as one of the first things you say. (I'm a Brit; this is intended for speaking to Brits.)