[...] and how many can you receive as a Newbie?
I wouldn't worry about merit
limits, because you're in no danger of hitting them

You'll start receiving merit when you start making decent posts.
Method A: If you have knowledge, then share it with others.
Method B: If you don't have knowledge, then ask (genuine) questions.
Make an honest attempt at either of the above for the next month and I guarantee that you'll receive some merit!