I'm not an expert but if your playing with friends its probably the heists, and the business missions (but I don't know if they are in the 360 version)
If solo what I'd recommend is do the first heist with randos, buy the armoured car you use in that and do single player available missions on hard difficulty and stay in your car as much as possible. In 99% of the time the bad guys cant kill you while you are in the car. Its possible to finish some missions (most of the drug ones) in like 3-10 minutes and they net between 20K and 7K. I'm sure there are more optimised ways but I've banked a fair amount just doing that when I've been waiting for friends to join games.
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