How does one write a good solid business plan for (1) a rehab and resale business when you don't know what properties will be available, what rehab will be required, what the costs will be, and what the property will bring on resale, (2) for a supportive housing business when you don't know what programs will be valuable, relationships you develop, and what income can be generated, (3) for a note brokering/investing business when you don't know what notes will be available and at what discount.""

It's better to check first.This article has a list of breeds that many insurance companies do not allow (Doberman Pinschers are one of them):http://www.psychologytoday.com/blog/canine-corner/201405/14-dog-breeds-blacklisted-insurance-companies

Good advice above, although I wouldnt see forget reading, just that actual experience and people that can answer direct questions is very valuable!

And it's really valuable to talk with the seller or seller's agent before putting a offer in writing. 

Thee are tons of valuable info right here on BP.

Been reading lots of articles, books and listening to BP podcasts. 

Make sure to listen to all the BP podcasts, read the articles on the main blog and be active in these forums to learn a ton very quickly about any topic in real estate you want to know more about.This is also a great place to meet people that can be assets to your business.

They are both great at learning the fundamentals.By the way - here are my favorite articles on Wholesaling: 9 Reasons You Couldn’t Find A Buyer For Your Wholesale DealDon’t Start Wholesaling Until You Read This: Wholesale Advice from a Fix and FlipperHow to Start Wholesaling: Getting Past The Education and Into the FieldOh - and don't forget to set up your Keyword Alerts!

Recommend you read this article about how to run a credit check.  

Here is an article talking about which markets are best for cash-flow, and which ones are best for appreciation.