Около is new and never been introduced. Вы and Ты are impossible to distinguish when to use what. Вы is supposed to be more formal and plural YOU, but there isn't enough description to distinguish between plural, singular, formal, or informal. All should ve correct.
Essentially none in the spatial sense. "Около" however can also be used figuratively: "сейчас около пяти часов" - "it's about 5 o'clock"; "кошка весит около 4 кг" - "the cat weighs about 4 kg" and things like that. "Возле" can't be used for that.