1. working experience is very very important, not for admission (only), but also for your future career path.
2. given that you don't have any background in economics, or any background in a quantitative discipline, you can forget any solid master in economics. Indeed you should also consider a soft business master instead of applied economics program since you are more likely to get a better school there.
3. it is a very bad signal to try any company/school that you 一边复习一边工作will吃不开, since this shows that you are not good in time and pressure management.