PLease Help me to Choose apps

i was trying to buy the macbook pro and finaly got it in the previous month by the saving of my pocket money today my semester exam result announced and i got the second position and fortunately my uncle also attend the function now my uncle offer me to use his credit card to spend money under 700$ and i want to buy the video editing apps for macbook pro please tell me the all essential softwares because its a chance for me to buy after that may that chance never come to my life moreover i only want to buy from mac app store please please please suggest me the apps which i should buy