Yes - or to be clear, it is the first park where you want to book LLMPs.
You need to tap into one ride to unlock tiers and cross park LLs. So just make sure you tap into something (expiration and MEPs don’t count).
Start
Yes.
There are a couple of LL specific threads that have very good FAQs in their initial posts (actively maintained). I highly recommend. 
Start here:
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