@Ashley Hughes no there's too many free property management apps to justify spending money on a website at this stage.

At this stage it would just be a waste of money.

Selling costs (realtor, staging, etc.)?

Any recommendations on insurance companies that provide reasonable rates for flips while in the renovation stage?

If you want to compare your findings to Zillow, go right ahead, but do the exercise of searching out truly comparable sold homes so you can learn how the pros do it.You should also be going to as many open houses as you can at this stage in your career, even if you have no intention of buying anything.

I'm still learning, so maybe my confusion is jut because I don't know what causes cost over-runs...On the PB Podcast, I've heard about getting an itemized bit or statement of work, breaking-down labor vs materials, and paying after stages of work are completed, but I haven't heard who's responsible for cost over-runs. 

No need for an LLC at this stage of the game.

You can ask around to see what your county requires to get the proper permits for a construction project like that, but oftentimes they require an architect's draft of the additions and multi-stage reviews by the county of the additions in the various stages of being built, among many other things.

Use post-lease period to fix, stage, and sell the property.

Far too many get stuck in the "paralysis by analysis" stage, thinking they just don't know enough to get started.