I think this question is dependent upon location.

Depends on your market and competition.  

I also remember a time when we could claim a dependent on our tax returns even if the dependent didn't have a SSN. 

It really depends.

Just be sure to clarify that she isn’t a leaseholder but is authorized to reside in the unit.If you’re concerned about liability or want more peace of mind, you could ask the primary applicant for additional security, such as a higher deposit, depending on what’s allowed under Colorado law. 

Sometimes they forget to tell you that many tenants in Detroit don't pay (depending on the property manager skill and the type of tenant) - but taxes are very high in the city and so is insurance. 

Hi Saul, it depends on what you're looking for - cash flow or appreciation?

Depends on what your goals are. 1-4 units are still residential, so it doesn't really matter how you start.

Depending on what state you're in, you may need a real estate broker's license to start and operate a management company.

@Stefano Vrolijk it all depends on your credit history, whether you have an SSN/ ITIN and how much you can put down.