Graphics: a graphics artist, Music: hiring a music composer, Sound effects: purchasing some cheap/commercial sound effects and then modifying them. There is also a tool that can generate some basic sound effects, but I've lost the link to it. Perhaps someone else has it?
This question is not formulated properly. What you should be thinking is: what work you should be doing that will give you the highest impact with the lowest cost/time. So basically, do what you do best and fast!
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