First is keeping track of who invested what, who is owed what and when they are owed it.For that, unless you are talking about tens or hundreds of people, a simple Excel spreadsheet should be fine.

That's fine call it an acquisition cost or project management fee or something.

yes that is fine

Flipping in those areas are fine.

Ludes said - keep mailing to them if they're fine with it) and they will eventually call you when they are ready

While economics are important so is the fine print.

This would be the riskiest because if something were to go wrong the builder would be getting paid as he goes from the bank so he would be fine and then the bank would be in first position leaving you at risk for the deposit.

I wonder if I would be fine doing my first wholesale deal without being incorporated.

But what makes me happy is that the cast Iron pipe is good to go and should be fine for the next 10 years as per my plumber!!!  

Being a condo investor is perfectly fine.