Line up a good real estate lawyer and accountant as well if you plan on buying multiple properties and they will advise how to structure your purchases to best fit your plans.
You need to shop for the right realtor. Most sell to home owners and do not have the slightest idea how investors buy properties.
Assuming you know exactly what is required, evaluating cash flow, due diligence, structuring an offer etc, sit down with several Realtors and chose the best fit from the lot that understands how to buy investment properties.
The biggest problem I have found is that most refer to all income in excess of taxes and debt payment is positive cash flow. Nothing could be farther from the truth .
It would also be to your advantage to study up on the are of negotiation. This will come in very handy when dealing with both the seller and your real estate agent. You will find yourself negotiating with both during the process.