You need to have a legitimate business in place in order to sponsor the 401k plan.Fidelity does not offer self-directed Solo 401k, they limit investment options to stocks and mutual funds only. 

I haven't found an agent to sponsor me because I don't have my license yet.

Hi -I'm an investor & new partner working on a $1M+ deal with a syndicator / sponsor.

If so, how does one go about finding a sponsor for that reason?

We're finding the opportunities, now looking for sponsors to get involved in the deals.  

We (New Western Acquisitions) are sponsoring tonights event.

@Patrick PlummerIt sounds as if you may qualify for the Solo 401k and yes, it would greatly simplify your situation.Unlike an IRA which is an individual arrangement, a 401k is an employer sponsored retirement plan.  

If it not done as a syndication, the sponsor could find themselves in trouble with SEC.#3 is fairly passive if you have a good turnkey company, good location and a good PM.Of course #4 is all you although you could partner up with someone else.So it comes down to your goals, the level of passive vs active investor that you want to be, your resources(Time , Money, Experience).Your choices will depend on your goals. 

They both sponsored my podcast but I also carefully looked at them before associating myself with their companies. 

I am about to enroll through SABOR for my real estate licensing course and thinking about hanging my license with a sponsoring broker such as Texas Sponsoring Broker or Your LLC Broker afterword.