Dual Classing help

First thing to do is to check if you have the stat requirements.
When dual classing you should aim at progressing in your second class. Trying to pick up skills from both classes will take away attention and fun out of the game.

Because you can only start with a kit I recommend using EEKeeper to transfer your kit to the second class. An easy way to do this is to start as the kit. Save the game. Go to EEKeeper. Switch the character to the first class. Save. Load the modified game.