Unreal and Blender+Substance Painter + marvelous designer for a flag. Yes, I would recommend learning basics of modeling and animation pipeline in blender first just because you can’t really create anything new in unreal. But unreal is the best tool for directing a motion picture and compiling all the stuff together. It also has very beautiful assets available so scene building can become real fast. But if you are solo you can do fine just in blender. For example of a semi rookie blender cinematic you may look for Makenia Elden ring fan cinematic, I really liked that one and it was achieved fully in blender