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A consistent final outcome can be achieved by starting with a top-down integration view, even if some of the details need a bit of work later.
One such framework is presented in this chapter, consisting of a set of 9 common assembly patterns and their typical inter-relationships.
Use of this "pattern of patterns" (i.e., the integration pattern describing links between assembly patterns) can provide a fast start-up skeleton for an enterprise model.
If you haven't got an enterprise data model, consider using the integration pattern presented in this chapter as a starting point for your model. It may take less time than you thought possible, and deliver value in the very short term. (There will still be lots of hard work fleshing it out, but it can still prove to be a robust framework.)