In journey builder, I'm trying to best understand the Data Extension "entry source" as a way to automate a Welcome Journey for new subscribers. I've created a DE where new subscribers will manually be uploaded via a CSV (DE called "Client Welcome Queue"). I want Journey builder to check for new subscribers in that DE every morning at 6:00 AM. and add any new subscribers to the welcome Journey.
I see the Data Extension entry source, as well as setting a schedule for this to run. I don't see a way to separate new subscribers from old subscribers in terms of setting an attribute to check against. Does SFMC do this automatically? Also the second step in this process is "Contact Filter", but I don't want to filter at all so can I just skip this? Screenshot here: https://www.screencast.com/t/ciEbgFzgk1
I've spent quite a bit of time reading up on this but nothing seems to answer my question although I fear it's blatantly obvious. Any help appreciated.