As I mentioned in my post Anatomy of test automation, there is a lot more to Test Automation then the Test suites themselves.
So if I was starting from scratch, I would take a step back and try and work out where the team is at, and where it needs to go.
For me, the first three problems to tackle are:
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How can the System Under Test be stood up and and configured automatically to allow automated testing to be carried out in isolation.
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What test data is needed, and how can I control the SUT and put the system in the required state
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What is the most critical path that MUST work for the product to be in a releasable, functioning state. Depending on the system and what risks are identified, this will inform what your first test should look like.