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When running a campaign for a client I was thinking of running the campaign with the keywords as they are to establish a baseline and then adding keywords to show how it could be improved?

I'm new to Moz and SEO. When setting up a new campaign there are some keywords pre-filled. Sometimes there are a lot. Sometimes they are very client-specific rather than for the sector or for a search. Sometimes there are very few poor quality keywords. Should I research keywords so that there are as many as possible relevant keywords when first setting up the campaign or leave it as it is and add keywords later?