The Real Estate business, as those who have posted before me, requires consistence and persistence. There are many sources for motivated sellers, and the harder it is to get the list, the better the leads :)
My recommendation is to pick a type of lead source and marketing and stick to it (follow the ideology of going deep, not wide). Pick a lead source (probates for example), and marketing (direct mail). The key is to do this in a way that you can systemize and also quantify. That way, you can look back after 3-6 months and see how effective it was by analyzing cost per lead and how many conversions. I would also recommend sticking to one county at first (if we are still using probates as an example).
That way, you can either continue and expand to more areas, or open a new lead source if its not something that works in your area.
The main thing is to just keep marketing, no matter what, but do it in a structured way so that you lead to more of an investment company and not just a mom and pop that does a few deals here and there (unless that is what you want).
Good luck!!