A:
I was born in Balakhna. Balakhna is a small town near Nizhny Novgorod. Right now the fireworks are rattling outside the window, because today is the day of the city of Balakhna (never start a sentence with 'and'. also, there's no need to capitalise 'Day', and you should watch your punctuation).
I entered an university (it might be even more natural to simply say the name of the university) and moved to Nizhny Novgorod.
I am the only child in the family, and my grandmother spoiled me. I stayed to live in Nizhny Novgorod.
I often come to visit my parents in Balakhna (this is the most natural sounding order of the sentence).
I work with accountants, I advise them on work with the accounting program. I like my job. I constantly learn new things, and thanks to my employer I regularly rest at the recreation center. (Nice last paragraph! There's nothing to fix here :D)