Looks like you have had some good answers already. The key is disclosure when you are buying or selling a property. It should be stated on the agreement-of-sale. Like Terrance said, some bank owned or REO listings will not allow the agent to collect a commission when acting as a buyer. I have never really understood why but that is another story ! But the bigger picture is that when dealing with consumers and entering transactions disclosure is critical. Good luck !
As far as i understand, the only extra thing you need to do when you are doing investment when you do have a R.E. License is to disclose it to all the parties. Other than that its just another regular transaction.
I would say it is just the opposite. You will have access to all listings as soon as they go on the market via the MLS so you will know about them before the public does. When you write an offer for any property, you have to disclose that you are a licensed Realtor, same as if you list your own property. Hope this helps.
Hope that helps,
Terrence Charest, e-Pro