to be honest these kind of question already asked zillion of times,are you coming from realmcrafter community? like others said dream big start small,3d gamestudio is really different from realmcrafter,and any REAL game-dev can say,by your experience and such,it's like you are thinking to build a ferrari car while you only had experienced building paper car,i know it sound to be rude but just wanna tell you the truth,just start small,learn and learn, improve, good luck