I suggest making sure you're with a company that is providing on-going, extensive training in lead generation and the other business aspects of running a real estate business. If you aren't then you'll want to get that training and/or coaching elsewhere.
I joke with my agents that they aren't "secret agents". Get out into the world and let people know you sell real estate. That doesn't mean shove it down their throats but it does mean talk about it. Get involved in your community both online and offline and genuinely get involved. People want to do business with people they know, like and trust. So get out there and meet people. Let them know what you do and how you do it. Ask for their business and for referrals. Then deliver on what you promise. And be certain to reciprocate with referrals to those that refer you.
And as a new agent do as many open houses as you can find. It's not sexy, but it works! A close friend of mine made Rookie of the Year in her office when she started in the business and she did it all from contacts made at Open Houses. Again she was out there meeting people.
As for investors, many people call themselves investors and are really tire kickers. The real investors will expect a lot of street smarts from you and you'll have to earn their business by proving yourself before they'll give it to you. As a new agent I suggest focusing on get some closings under your belt before pursuing investors. You'll have more knowledge and you'll have some cash in the bank.