The typical team has Attornies/Lawyers, real estate Agents/Brokers, a CPA (or accountants you know and trust), Inspectors, Property Managers, General Contractors, and Handymen.There are several other main things you should do after you select a niche and property area market.  

If you have any interest in that area for your business, you can check out what the market for cleaners for small-medium property management companies is like in your area, and whether it would be a good niche for you.

I'm a partner in a sort of unique company that is a full service appraisal firm (all property types) but also provides civil engineering (mainly subdivision design and development), land surveying and title analysis services.

Its a unique property.

I am really just looking to network and learn as much as I can while figuring out which niche is best for me.

You have to understanding when it comes to this kind of marketing/sales niche, you'll encounter plenty of angry people.

I think catering to military rentals in Oceanside, national city, or imperial beach might be a great niche for you to get into using your VA loan.

Uniquely, however, we need a true owners unit give the four person family I head (me, wife, and two young kids).  

It des not take too much money and teaches around all (just about) niches but you have to be kind of brave and be a little bit selective on what you tell the homeowner.  

There is a market niche  for every investor type.