It's not that it's wrong - but you have to walk before you run.
MMs are like going from crawling to signing up for a marathon in a 24hour span.
MM are tricky - and by that I mean that not only do they take practice to "Get right" if your learning , but I also mean that it would be VERY easy to accidentally offend someone who is a native signer (hearing or Deaf) if you just start "doing MM" - they could easily think you're making fun of them - which would be a major faux pas, and could take alone time to explain away ... it's better to have them show you, then to just start "doing them" from what you've seen or read in a book.
no one is going to expect a beginning ASL student to even know about MM - let alone use them - once you become involved more in the language (meaning living language, not just word retention) you'll start adding them ...
I second what Etoile said - it's nice to know they exist - but for the moment put it away for later, and focus on learning culture, and real life interaction skills... all the rest will fall into place.
HTH - remember , we're trying to help ... no need to have extra scrapped knees if you can avoid it right ?
