WI earlier 'American' army?

In late 1774 the First Continental Congress rejected a proposal by Richard Henry Lee of Virginia to form a nationwide militia.

But WI this proposal succeeded?

Who would be the 'national' commander? How would the regular regiments formed by the New England colonies from April 1775 fit into such a scheme?
 
How were those regiments supposed to be organized and otherwise formed?

I mean, was this based on any existing structure, or were they to be created from whole cloth?

I don't know anything about this plan, so I'm trying to understand it.
 
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