We’re working in a smaller market like Cornelia, GA, where comparable sales data can be limited, and want to make sure we present a strong case to lenders.

I'm not sure why not - one of the great parts about real estate investing is that you can build a team around you for aspects you aren't as strong at or simply want to delegate to someone/expert and do the others yourself - look up "Core 4" for example - where you can have an agent, lender, manager, contractor all at once for your investments and can theoretically just let them do all the interactive work

Use your $30k for down payment or initial rehab but budget extra for unexpected repairs.Your lead methods (D4D, DealMachine) are strong.

The Main St property in Grainfield, KS, offered a promising opportunity due to its low purchase price and strong potential for a high return after renovations.

Another important thing to keep in mind is that markets with strong cashflow won't typically have as much appreciation.

It is entirely possible to self-manage with a strong cleaning team.

I’m reaching out with an investment opportunity in a real estate flip project, and I’m currently seeking a limited partner to join me.With a strong track record of successful real estate investments, I am looking to partner with someone who shares an interest in capitalizing on the potential of this market.

I can tell from your questions that you are in a bit over your head and before you make an incorrect decision you should STRONGLY consider a consultation with someone.

Boston in particular is a strong market with great appreciation, a great tenant pool, and rents being as insane as they are it's nearly impossible not to pay less when you house hack vs. rent. 

One of the biggest factors in successful flips is building a strong team: contractors, agents, lenders, and property managers.