I jumped into the real estate game five years ago without doing much research about the business. Looking back, I wish I had known more about marketing.
My first sale was a referral from my mentor about six months after I started.
Talk to all the different brokerages big and small. Find the one that best fits your strengths and weaknesses.
You need to have clients to work with. Be it buyers to sell property to or sellers to list their properties, either way you need to get in front of people and let them know what you do.
Marketing yourself is the key. Open house, social media, blogging, talking to friends and family, door knocking... Once you get the basics of marketing down explore more advanced methods, Facebook ads, Adwords, website SEO and on and on.
My advise is to stick with one marketing method and master it. Only after you master it should you try another method. I wasted so much time bouncing between different marketing never really mastering one, just being mediocre at many of them. One last piece of advise, never buy shopping cart ads. Branding and marketing are not the same thing.
Best of luck.