If you do decide to do mailer(s), then I would advise you to personalize the card and do a handwritten note. 

This may be controversial, but "true passive income" in my opinion is one thing and one thing only.

If true, then you would want to have each property 100% in the name of the LLC, with a mortgage and deed in the name of the LLC. 

Leverage - someone mentioned Real Estate doesn't beat stock market returns and while that might be true in absolute terms, it's definitely beat the market when you consider leverage.

It's likely a scam anytime they sound like AI or the grammar is weird or they use the word "kindly", if they ask for you to respond to them off-platform, if they say their employer will pay for it, if they ask if the dates they've specified are still open (when they can clearly see they are open on your calendar), if they ask for a video of your property (they probably want to set up a duplicate listing with your photos and video and scam others out of money), or if they want a long term booking and they have just joined the platform and have no reviews (could have been evicted from somewhere else, and hope a newbie will let them in with no background check, they'll end up not paying or credit card is bad).  

Rodrigues' recommendation may change this), but my next question would be, are there any cities/markets where 1 of the following are true: 1) You have family/friends that live there, 2) You travel there frequently (either for vacation, work, etc.), or 3) Somewhere else you've lived before AND know the area well?

While I help people find their dream homes daily, my true passion lies in real estate investing and building long-term wealth.

There are a very limited and reliable few of lenders that do true DSCR 2nds.

Some will be ok in 2nd position and some will not and force you to refinance out the first - but those are options that are probably cheaper than credit cards 

The best advice I can give you for studying for you license is to voice record yourself reading questions and answers on notes cards.