So this is not pertaining to any specific property just yet but my question is, if i soon give an offer or LOI for lets say a 20 unit complex that i identified through direct mail and my cold calling efforts, what team members will i need to help me complete the deal?

Judging from the vibe on the BP forums I'd say a lot more people are not attending than are attending.

Let’s say a downturn happens, and investors are ready for it, won’t that counteract the effects of a downturn?

First of all, I want to say a huge "thank you" to everyone who is actively sharing knowledge on BP. 

Your realtor/property manager should be able to help you determine how much more buyers in the area are willing to pay for, say, a 3 bedroom versus 2, or granite countertops versus laminate.

Not knowing the specifics, I'd say a good going in argument would be to renovate the 3 vacant units as well as the exterior after closing then systematically work through the remaining 9 units as the leases expire.

Now the next question I have for you would be.. what about when I plan to expand, let’s say a year later, and buy another rental property with potential negative cash flow?

There is less pain for immediate hotel owners than say a MF owner who overleveraged his syndication.

They say a jack of all trades is a master of none but honestly you should learn from every angle. 

I say a person on lease or even John Doe and all occupants on the eviction.If they don't have the utilities on, I call code enforcement and they will set everyone on curb in 24 hours.