You can, however, ask a Realtor to just list your property in the MLS for a flat fee and do nothing else, meaning you answer any and all enquiries, show the property, do your own negotiations and make arrangements for the closing with either a title company or a real estate lawyer.

I’m looking for some advice and feedback on my real estate investment strategy.

Maybe find a broker who has access to different companies.

I would have added Owasso to your list, and Jenks is a desirable location, if you can find a property to contract on. 

Yes they can do averages based on what they saw on the last three remodels. but have zero clue as to the little nuances that pop up on every job.I would find a good General Contractor and pay him to help you with this.

Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

How do I find off market deals and wholesalers that can find me suitable properties in need of renovations to purchase?

I would recommend shooting smaller as well as working on getting your real estate license if you do not already have one as that is a big deal for most PM companies.

With that being said I would be careful not to just chase cash flow but instead find a mix of appreciation and cash flow, but at lower leverage. 

I think that most millennials that live w/ their parents aren't focused on investment real estate.