Far too often when a company sets out to create a digital marketing strategy, they will forgo considering who will actually carry out the digital marketing services that they require.
Some companies will let the marketing company create the entire strategy and take a hands-on approach, but it is becoming increasingly popular for the company to create the core of the strategy on their own so that it really has the feel of being something that they put out, not something that they farmed out to some external party to create.
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Of course, creating this strategy without at least having a digital marketing company in mind is a huge mistake, as the companies who will end up doing the service will do far better if they play to their strengths, so knowing the strengths and weaknesses of a digital marketing firm is absolutely crucial when looking for digital marketing services.
If you can trust them to not influence your process of making a decision, then bring them in early in the process, but if you don't want to or can not afford to bring them in for the entire process, just keep them in mind, work out the project as if they're already on-board and ready to work.
Of course, procuring digital advertising services is not as easy as it might seem on paper once you've drawn out the plans. Many marketing firms will be working on projects for many clients at once, making them spread thin and a little bit reluctant to take on additional projects, particularly for a price they don't believe is worth taking the time out of their busy schedule to work on.