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You should import leads into the proper Acquisition Program for each Event, Tradeshow, List Vendor (and date), etc... this is how Marketo works.
Your scoring system will listen for Program Statuses, Data Changes, etc to process the leads as they progress. There is a lot of info out there on this.
Ideally you add Period Cost for each month that there is a Cost for this Asset or Channel, however, that's only if you use RCE. If you don't, you can just plug the Cost into SFDC.