happy to help! re: SFDC integration - even with that, I'd expect to be doing a lot of massaging, to be totally honest
I think you can go either way, re: # SDRs! we had the whole team but it makes perfect sense to experiment on a smaller level to start...
we had a broader play, where we were capturing Intent from multiple sources: G2; web visitors (I've done this thru multiple different tools which are somewhat interchangeable - Leadfeeder, Warmly, Clearbit, a lot of tools can tell you Account of anonymous visitros); Capterra
every Account was tagged with below fields:
SDRs then leverarged Intent Topic to launch a personalized play based on what we knew the Account cared about