Guidance Needed for Salesforce and HubSpot Enrichment Flow Setup

Hi there! I'm new to Clay and am managing our Salesforce instance. Does anyone have experience in setting up an enrichment flow of contacts and accounts with Salesforce or HubSpot? I'd like an enrichment to occur on 1. The existing data that's missing certain field values and then 2. anything that's a net new record, do a quick review for missing data of those records. Any guidance will be much appreciated!!