First is figuring out what data matters, how you'll collect it, and have someone set up the systems to collect the data. You'll want to ask yourself "what questions do I need answers to", and then work backwards to figure out what data you need and how to go about getting it all in one place.
Second is having someone that can do something useful with that data.
You might be able to find someone who is both willing and capable enough to complete the project from start to finish and then continue with analytics.
More likely, you would set up the data stuff with someone on a contract, then hire an analyst once the data is usable.
It might be beneficial to have some overlap in timing to be able to have your analyst and whoever is setting up the back-end stuff collaborate.
Find someone who has built out what you need, then hire a data scientist once you have data in a usable setting.