GTA Vice city game for PC need help?

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i just completed the mission keep your friends close and i killed LANCE VANCE after killing him i killed SONNY and after that it was like the game finished the names of the makers of GTA VICECITY appeared i thought the game was over ,but soon 30,000$ were given to me for the completion of that mission and quickly i got like 5 calls from various people . I have completed kaufmann's cab mission, cheery popper, filmstudio mission, malibu club missions,print works mission, boatyard mission i have just bought sunshine autos what should i do next there are 4 garages and a list of cars required and there is a map to several races. Firstly the should i get all the listed cars to the garages and how can i participate in those races i have competed in three races in hymen memorial stadium the game stats say 54% completed. i have completed 13 rampages and found around 15 hidden packages pls reply what next should i do?