Corrections in red.  Stylistics and comments in blue.

Friday

Hi, friends!
Today is Friday.
Such a nice day of the week.    TGIF!!  (Thank God It's Friday!)
I have many plans for the weekend.
I need to take my car to the service station; something wrong with the gears.
It chirps like a cricket. :)   
Hope it won't be very expensive.
After that, I should watch two or three films in English. :)    For numbers between one and nine, we usually write the word, not the numeral.  However, it is not a rule that everybody follows.