Pick a niche or two to focus on and start establishing relationships with those that deal with those asset types. Get an attorney or two or a preferred law office to handle all the legal stuff to make sure your golden on any syndication law and making sure the funds are handled correctly.
You are going to have two sides to your firm depending on whether your acquiring and managing as one part then raising capital on the other. Which is similar to any other investor or investment firm. So having the right folks to help you with both is needed.
Key relationships in the markets and submarkets that you are going to be working in. Make sure you go to or keep tabs on the master plans of the municipalities you are working in because that will keep you abreast of what is going on from a market perspective and such.
And bring on partners or form partnerships with people who are like minded and have the experience and leverage you and your firm will need to do business.
My answer is something of a micx of what I have researched and been told. So hopefully it helps in some way and hope that some others can fill in more to help you. I would definitely love to see what others have to say.