I'm going the traditional route of a conventional mortgage, fighting underwriting, etc.

Traditional landlording is the least profitable and riskiest way to hold property.

For my day job I work as an Actuary and my primary experiences is in Risk Management, Asset-Liability Management, and Model development - which I hope to translate most of these skills into my real estate investment plan.I am interested in growing long-term wealth through acquiring a portfolio of cash-flowing rentals. 

I just paid off my primary residence and wanting to buy rental real estate in OKC.

it matters what KIND of financing you get for a fannie/Freddie loan you need it to be in some individuals namefor traditional commercial it'll need to be in an LLC (or similar entity)In small banking and equity lenders there are limitless options though.

@Carlos Rodrigues If it’s your primary you can get a HELOC from any bank.

This is my question:  Since, I now have a primary residence mortgage how do I get a loan for this investment property?

Any locals have tips on buying a primary residence?

Are there any loans where I could claim primary residence (and possibly receive fixer upper funding like a 203k) of a commercial sized property?

USDA is a great option for your first single family primary residence.