-고 puts an action before 찾다, which covers finding a thing, looking something up, and calling on a person. 옛날엔 지도 보고 찾았는데 'they used to find it by looking at a map'; 일단 정해놓고 찾아보기 시작했죠 'I picked it first and then started looking into it'. The form you see most here is 찾아보다 'look it up, look into it', and 찾아뵙다 in the first line is the humble 'come and see you'.