Exploring Clay for Niche Market Targeting: A New User's Journey

First time listener, first time caller. I'm working my way through tutorials to see how well Clay will work for me. I target fairly niche markets with nice ICP. I'm building my first table and trying to build with behavioral health hospitals/clinics. The find company is not working that well because it is still finding too much "junk". Instead of starting with build a table, can I scrap sites to build the company table