Is it possible for a user as a newbie to send merits?
Yes
If yes, How many?
Maximum of 50 to any user per month
and how many can you receive as a Newbie?
Maximum of 50 from the same user per month. You can receive as many as possible but max of 50 from the same user.
Read about merit system here:
https://bitcointalk.org/index.php?topic=2818350.0