Levelling up initially can be seen as more difficult because there are less ways to level up at first. With in the first in game day if you playing you will probably receive a call from Martin Madrazo, who will offer you to do dispatch missions. These can be great for levelling up easily and you will receive around 10k for doing it. When you reach 50k you can register as a VIP and you can start doing VIP work such as Headhunter and Sightseer, which rewards slightly more money and can be done without creating a new session for the job, as they are done in free mode lobbies. However if you prefer playing regular jobs I’d recommend the mission ‘Death Metal’ which can be selected in the online menu. It’s very quick so can be replayed for levelling up fast.