If I sold my current home I could walk away with about 300k.

The property is newly renovated pretty  much all around.New floors, kitchens, bathrooms, paint and trim, 2 carrier ac units, new furnace, 2 water heaters, split electric and gas.Natural gas, pub water and sewer.I will be wrapping closing costs into the mortgage.Ideally, this will be my first home so I will be using this for initially a house Hack, but planning on adding 1 master sweet with walk in closet and bathroom over the empty space above the garage.I was just toying with the numbers to see when we move out if this will make money monthly.

I think the book is a good introduction to Notes and would fit under the popular theme of “Notes for Dummies”.

As you can see, once I run the numbers on this, I get an "Inf%" in ROI during the refinance phase, no clue why.My initial reaction was that this would fit the BRRRR model, but now I'm not so sure.

And yes, a decent contractor can give you an accurate estimate with a single walk-thru...they don't need drawings and all the formality...though some degree of accountability is needed.

Wedging into a Solo 401(k) that is not a truly good long term fit just to avoid that taxation is for most investors a losing proposition.Plan qualification and determination of which plan is best for a particular investor, their situation, and investment goals is certainly not a one-size-fits all topic, and there is no one right answer.The #1 consideration with the Solo 401(k) is current and ongoing eligibility. 

You decide you want to find a multi-unit property in a certain city, say Tulare, and then you find an investor-friendly agent in Tulare with access to the Tulare MLS so they can send you listings that fit your criteria.Find the area first.  

I go for walks every evening with my family, and take notes on my phone about which houses look like they need work, have absentee owners, etc. 

It would also help with learning investment language, learning strategies, when to stay or walk away, consider or reject.

If the lease terminates end of June, you are going to walk the property in 45 days anyways.