To give us an idea of the overall feeling of your brand, let us know which styles you lean towards
Looking for iTunes cover art. Logo should sit naturally in a darker background in a 2048 x 2048 px square.
Logo should have a prominent "Trading Story", and a less prominent though readable "For NEW Traders"
As for accompanying graphic, either a stylized quote or an uptrend may be good. Not sure on the graphic. The logo you provide should act as both cover art against a dark background and a standalone logo.
The attachments are examples of a good iTunes cover art. Background is darker to stand out against the white background on iTunes. Title is readable.