Should i work first or study first?
Some things you need to think through: do you want a Master's Degree because of the prestige of it, or because everyone does it, or because of the opportunity of going overseas? Will a Master's Degree actually help you in getting future work opportunities?
Some fields do require you getting as high a degree as you can get, such as scientific research or lecturing. On the other hand some fields value experience more than on-paper degree. Which one is yours? Discern and prioritise. On top of that, do you know exactly what field you are interested in for your further studies? Work will help you find it.