His wife's paycheck goes to cover their medical insurance and burden.I tentatively agreed to "hire" him to do this project--demo the existing old tile & backer board down to the studs, (bathtub is OK), create a new surround with ceramic tile & a glass band going around the 3 sides.

This is a loaded question that is near impossible to answer without extensive financial information on your client's age, responsibilities, income sources, other investments, insurance, medical needs, the list goes on and on.

According to Michigan law, Marijuana (medical or otherwise), is considered a "schedule 2" controlled substance. 

.- Almost everything went slower than I'd like.

If you have insurance, or property with equity in your name, a judgement against you could force you to sell and pay them cash for medical claims.

Once you get comfortable with the process and build out your team, you can aim to acquire a multi-family building and force equity through improvements / raising rents.Marc makes a good case for starting out slower and learning.

On top of this, we have a growing medical community for our growing aging population, and we are also starting to attract more entrepreneurs because of the cost of living but still being in CA based location. 

I know for sure the dwelling, liability and medical should be included, but I'm not sure about the rest.

But now I’m like a medical researcher analyzing every variable.Currently I’m learning about tax lien investing.

As was mentioned earlier, just make sure you or your agent properly described why your offer is written at that price.As an agent in the Grand Rapids market, I know that homes are moving slower at this time of the year.