As an employer sponsored plan, it has some advantages over an IRA based structure in terms of contribution limits, capacity for tax-deferred and Roth money, and an exemption from taxation on leveraged real estate investments. 

Typically, investors like to see sponsors with skin in the game. 

So in my opinion there is no one sponsor that's going to be right for everyone.

Most sponsors are not great at marketing so it also helps to work with a professional who understands this part of the business well and can help you along the way.  

Looking for an attorney experienced in dealing with note/mortgage contractual violations as well as what constitutes or is leverage to stop a default interest rate, misuse of construction holdback by the servicer, accounting errors and or torturous interference Experienced sponsor/developer long track record , AAA market region, hedge fund capital local servicer.

As an active investor (GP) that means developing all the attributes that are consistent with being a good sponsor, to be able to identify, acquire, manage, and exit and asset that provide passive investor like yourself the desired returns.  

The oh we'll just sell or refi in 3-5 sponsor crowd that's never seen credit evaporate or values drop before may be in for a rude awakening.   

I've been doing some research but any information on finding a location, advertising the group, sponsors or whatever else you think may be important.Bigger pockets has already helped me so much, this site is great!

My current brokerage does not offer a lending arm and I was wondering if it would be possible to be sponsored under my current broker as sales agent while sponsored under another broker as a lending agent.

Your co-sponsor must also have relevant experience.