@Richard Pulido I am a broker that specialize is investment properties. Working with realtors is a good alternative but should not be your focus. When you choose to work with a realtor, research on craigslist, mls for agents who list reo's and interview agents that have ONLY or that mostly have reo listings and experience working with investors. Unfortunately and fortunately there are very few of us. Get on their buyer list.
When you have chosen a realtor, get another and another that have reo experience. Give them your criteria and have them to put you in their automated email program that sends you new foreclosures or ones that the status changes. When one fits, IMMEDIATELY contact agent that u want to see it and make offer. DO NOT HESITATE MAKING OFFER. You will most likely have multiple offers, so be ready to counter back with your highest and best price.
Now the majority of your time should be farming neighborhoods and promote that you buy houses. Negotiate contract so you have possession, then market them. While doing that, build your investor database, so when you get one, you can wholesale. To wholesale from mls is very difficult as asset managers or banks will not allow you to just sell paper. They want you to close and have stop gaps not allowing to do so.
Good luck, get started and keep it going. Share your experiences on BP.