My first time posting as I am brand new to the game.

Wherever you do invest, try and play by the rules.It can be a very expensive learning lesson which it looks like this will be. 

Getting the sellers profiles sounds good, but not generally allowed.This might bight you later when the platforms realize you are not the original owners.I'd get everyone's contact info and tell them you are setting up new profiles under your name with your bank account etc. and ask them to rebook under the new profiles.Then I would offer discount pricing to start with to get more reviews and build your brand.

LTRs are usually a 'safer' play, particularly if this is your first real estate investment property.

I know this is very ambitious, but I have always had big dreams (like playing D-1 baseball in the SEC).

General appreciationIf it is in a solid area, maybe the play is appreciation and then a few years later do a 1031 exchange to another, better performing property.With multifamily, typically you can't do STR, but maybe MTR?

Kidde alarms are more expensive than other brands.

I am willing to offer my services like social media marketing, branding, presentation, organizing events, crunching numbers for free.

Another thing, I had no idea how to get some private lenders, because I don't have a well-known brand, so it's harder this way.

I would assume little to no appreciation over next five years so I would model it and see where it plays out