Other players are needed too, but a PM is the big one.

If you aren't sure, I would study other sucessful players in your local market and on BP and determine what "niche" of the market do you want to carve out for yourself.

Although oil is still a big player in OKC, there have been substantial increases in other industries like aviation, health care, tech startups, and entertainment that I think will help balance out the power. 

It is a good way to network and get to know real estate players in your area.

Craigslist (it's still a very active player in the rental market - and if you can afford to you should partner with advertisers that build CL codes for you) 4.

are you listening to them on the player from the website?

I'm not saying these guys are not big players in the space, but I've never heard of them.Beware of people who just teach classes as their income.  

The key is to provide value, which is why a lot of the big players will offer coaching, because what you pay them is the value you provide.

I don't really know who are the players in Bellingham, if any big ones.

There is always the risk of loss but so far it has worked out well and allowed me to get some good returns and be a passive player in real estate.