I opened my TDAmeritrade account last year also to play around in the market. I stumbled upon a man by the name of Paul Mampilly who you can subscribe to his Profits Unlimited services thru Banyan Hill for $97 a year and sometimes lower when he offers a special deal.
I sincerely state that he has increased not only my knowledge of investing but I have tripled my portfolio's value over this time period looking over his shoulder (as he calls it). You might want to check him out on You Tube to decide for yourself.
He does market his service quite unabashedly but his over the shoulder portfolio look is amazing and fun. He expounds on the megatrends of the now and the near future remarkably well. His personal story is pretty amazing too.
Again, I have learned an exponential amount from his service in about 15 months time. Even if you don't follow his picks, you will learn an awful lot about the market, Wall Street, and making money.
And, no I don't work for him or am affiliated with him in any way. I just use his pay service. He has several, but I use the above mentioned Profits Unlimited and Extreme Fortune which costs more and is investing in riskier stocks than Profits Unlimited.
Good Trading to You