What questions should I be asking, what should I be looking for and what should I watch out for as a future investor while searching and interviewing sponsoring brokers?

The #1 determinant is the Tenant Pool.If you don't believe us, try putting several Class D tenants in Class A apartment buildings and watch what happens.

Took me many times of watching it to finally order the course. 

Get informed about real estate investing by watching videos.

And you've joined one of the best communities for all things real estate investing.1️⃣ Download this ultimate beginner’s guide: https://assets2.biggerpockets.com/uploads/user_file/file_object/1694/UBG_2018.pdf2️⃣ Read BP beginner books on investing: https://store.biggerpockets.co...Also, read Rich Dad, Poor Dad by Robert Kiyosaki and Think and Grow Rich by Napoleon Hill 3️⃣ Subscribe to BP podcasts or YouTube channel and watch their webinars. 4️⃣ Ask questions here on the forums.5️⃣ Visit (join) a local (and legit) real estate investment association.6️⃣ Consider joining a BP bootcamp: https://www.biggerpockets.com/blog/real-estate-investing-bootcampsI wish you all the best in your investing journey!

As any gambler knows:https://www.youtube.com/watch?

I've been watching the appreciation and collecting rent ever since.  

As you read these books, watch the BiggerPockets podcasts.

Interestingly, in the past few years that I've been watching Nomad, their reviews have gone from a solid 5.0 on Google (mostly fake I assume) way down to a 4.2 now. 

Not that things don't go sideways when agents are involved, they certainly do, but at least agents for the most part are educated on how to detect scammers, how to protect their clients, which title companies and lenders to trust, how to vet buyers, what to watch out for and how to avoid bad situations.