First you need to train to use mouse and keyboard. So maybe less intensity games would be better. For FPS you could try borderlands.

Second, some games play better on controller and some on mouse and keyboard. P prefer tu use mouse and keyboard mainly for MMOs, FPS, and strategy games where you need to do precision clicking. In some games I do one part with mouse and keyboard and another part with controller (like I play saints row with mouse and keyboard, but do the driving using a controller).