@Eric Martel CoStar data requires a paying subscription.

@Jessica Lawrence - You can key word "ADU" or "in-law" into most Redfin and Zillow searches to obtain this information yourself.However, if you connect with a Realtor, they can automate this process for you to see these properties thru their MLS Subscription. 

What tools, resources, subscriptions are critical for a newbie to succeed?

I have a subscription to costar as an essential tool for my success.

Then we have MLS Dues, REALTOR dues, subscriptions for esign, forms, dropbox, quickbooks etc.

@Asya EvansI have been trying several different apps to find the one I like most with the most convenient features.Many of these will allow you to try a free version- I’ve actually managed a property for an entire year for free and it’s been a huge help.Try these out and if you decide you like them you can always sign for a subscription.1.)

My start in REI came with getting a subscription to Audible and replacing Music, TV and Sports with listening / reading books (most of them twice) - starting with Rich Dad Poor Dad.

All discretionary purchases are on hold, and I'll be reviewing my recurring/subscription billings to cut charges that are no longer needed. 

Did you sign a Subscription Agreement or see a PPM?

Is it worth paying the subscription fee for the professional version?