In buying a turnkey property, the provider has usually gone through weeks if not months of acquisition, rehab, lease-up, and marketing, prior to even encountering you, the end buyer.

Possibly you haven't encountered the right people yet.  

However, its not whether you can or cannot conduct business as a real estate professional that could or would cause a problem rather its that you have been deemed to 'be' and have been trained to conduct your affairs as a real estate professional that would come into question should you encounter a sue happy seller or buyer.The disclosure removes any question of an ethics violation from later being used by someone in a court of law. 

What are things first time investors encountered when they started.

I wanted to do some sort of car advertising either magnets or sticker decals has anyone had any experience with this?

What obstacles or pitfalls may I encounter?

Have you had negative encounters like this at the beginning of your investing career?"

That's been my experience in dealing with the one's I've encountered.

The long term problem with Kiyosaki is that without an exit strategy, in a cyclical market, you will always encounter what is traditionally called "gamblers ruin". 

. :)I will warn you to be ready for a little sticker shock.