There's a big swing here in insurance and tax calculations I see and getting those numbers accurate are critical for your ability to not miss on good deals

It comes down entirely to your ability to commit to the deal and close it on time.

Things like your ADR, photo quality, current ratings, the number of reviews compared to your rating, and, of course, listing optimization (SEO).

I've heard too many stories of investors purchasing homes for STR use, only to find that they lose their permit or the ability to transfer it when they sell.

Through that lens I will try to answer your questions to the best of my ability:1.

depends on your credit if you can get a mortgage or your ability to find good deals that you use hard money for and then refinance into DSRC.  

They will likely have the ability to generate them.Disclaimer: While I’m a licensed attorney, I’m not your attorney.

Lates on a mortgage trade can impact your ability to get loans in the future. 

Let me add some new wisdom to this.Try not to see social media as "just another channel to try my luck".It is not a separate thing, especially doing SEO or paying for ads.When it comes to lead generation, it is not (just) about generating that lead.

For this I plan on charging 10%  of rental income as management fees to LLC-A.Some of the benefits of this vertical integration brought by LLC-B is: (a) Ability to contribute to retirement plans (solo 401K, etc)(b) home office deduction(c) health insurance plan premium, among others.