Having that experience and knowledge just helped us buy another house with foundation issues at a reduced price too.  

.), but most people start with some form of paid marketing as it's less invasive (direct mail, MLS, etc.).If you want to reduce the learning curve, ask a reputable rehabber in the area and tell them that you will do all the marketing and wholesale them the property if they will do the walk through with you and teach you rehab costs.

Best practice, in my opinion, is to air-seal the perimeter/ foundation to reduce air infiltration in the summer.  

The maximum length of the duct shall be reduced 2.5 feet (762 mm) for each 45-degree (0.8 rad) bend, and 5 feet (1,524 mm) for each 90-degree (1.6 rad) bend.

We went and they pushed the "reduced price" 3 day course which we signed up for.  

Just one more point to remember is they will typically add back depreciation which reduces the rental income on your tax return but doesn't actually impact your cash flow.

reduced rate or total exemption?

By that metric, I would invest up to $8k to reduce or eliminate the utility expenses.  

This will remove a lot of headache and reduce the risk of stupid fights....

You might could reduce rent but add in percentage rent above certain sales hurdles.