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The thing is, there aren't really any assignments these days, especially when two healing. As a shaman, your strengths are stacked healing on groups of people, big heals when a tank is going down, and your CDs. As you can see, that covers, well, pretty much everything. Rather than worrying about strict assignments, especially your first time through (I assume this is Mogushan Vaults), just try to keep the bars green, and you will find that healing tends to sort itself out, as most healers will play to their strengths naturally, provided you are comfortable with your class.
It's the DPS that generally need wrangling in a raid. "Stop hitting that, and start hitting those!"
Edit: One exception would be with dispels. You need to know who can dispel what, and make sure those are all covered. I think in MSV, the only real dispel fight is Elegon, and that will definitely be more of a DPS challenge than a healing one.
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