My question is would it be a good cash flow strategy to buy up these cheep tracts and use my knowledge to clear and develop the lots and sell them at a premium after?

As a newbie investor in the education phase of developing my rental business, I am looking to collect a wealth of resources to have on hand for market analysis. 

Can anyone recommend book or some resources about developing industrial warehouses.

This will help you develop a real plan that you can use to keep yourself focused and motivated. 

That is thinwall stuff and will develop pinholes over time.

Often developers and listing brokerages do not like dealing with new buyers unfamiliar with the process as they tend to believe there will be a high chance of failure if choosing that offer or going to contract.

In our market, a SFH provided the lowest barrier to entry and we used that deal to build confidence, and develop our negotiating, marketing, management, and networking skills.

I can offer this, I worked as a real estate appraiser for 14 years and during that time, developed a serious distaste for realtors in general.

In regards to fees for an ADU under 750 sqft:"A local agency, special district, or water corporation shall not impose any impact fee upon the development of an accessory dwelling unit less than 750 square feet.

Ten minutes later, she had developed a beautiful listing description!