After completing the Military Career Agent missions, you can begin running Level 1 Security Missions for various agents. These missions are a great way to earn ISK, improve your standing with corporations and factions, and gain combat experience. Look for agents in high-security space (0.5 security status and above). A well-fitted frigate or destroyer is perfectly capable of handling most Level 1 missions. Focus on agents that offer good rewards or are located in systems with short travel times. Always check the mission objective and enemy types before accepting.