Carol,
It's a bit simpler than that, depending on how you've set it up.
Marketo Program - if the leads in question were already in this program, you can set the Program to sync to SFDC Campaigns.
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Setup a new SFDC Campaign OR
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click on the Program summary,
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Press Salesforce Campaign Sync
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create new Campaign (or select existing)
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Marketo will auto sync all leads that are members of the program.
The other way to handle this is to explicitly sync a group of leads using a campaign flow.
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create a new smart campaign
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select the leads using the smart list (Member of Program, Campaign, List...)
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select Sync to SFDC OR Add to SFDC Campaign or Change Status in SFDC Campaign
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choose correct Member Status
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Run campaign (be sure to check the count BEFORE running).