Alright, this is very much a free game, very fun and unrestrictive. Do what you like. Asset allocation is (Dow Jones)-(S&P)-(T-Bonds)-(Cash). The asset allocation will be your major guidance in this. If you keep your allocation the same, you are essentially buying low and selling high.
Welcome to the realm of investing. Choose cleverly, young investor. You will face a whole new world of data and knowledge. Only the best may make a large profit! Apologies for any perceived pro-American bias in using the S&P 500.