ATTENTION NEW PLAYERS: Rather than as what to train, here is the Magic 14 Skills
"The Magic 14" The skill plan based on this post from EVE Uni. These are considered very versatile and core fitting skills and will improve the performance of nearly every ship. Several of these skills are required for tech II ships, such as Interceptors and Assault Frigates, so they will significantly contribute to your progress in the ship trees. You should aim for getting these skills to at least 4, and eventually to level 5. You can copy this plan and use the "Add skills listed in clipboard to end of queue" button in your training queue.
CPU Management Power Grid Management Capacitor Management Capacitor Systems Operation Mechanics Hull Upgrades Shield Management Shield Operation Long Range Targeting Signature Analysis Navigation Evasive Maneuvering Warp Drive Operation Spaceship Command