Scarface: The World Is Yours/Coke

Cocaine is the foundation of your empire and has been in short supply since your downfall. You can pick up the odd gram or so from the people you kill, but that isn't really going to be enough. You have to make deals with the dealers, who will sell you mass sums of coke for mass sums of money. However, you make more money than you lose, so it's always worth it – unless you blow the deal that is. The coke you have on your person you can sell to your fronts for cash, but the larger sums you'll have to distribute to all your fronts via coke runs.

Coke runs
After you gain a storehouse, you'll be able to do coke runs and the first one will be waiting for you in your storehouse for you to practice. To unlock a coke deal, you have to press, then select Empire, then Business and select one of the leads, complete this mission, and providing your gang heat isn't too high, you'll get a larger supplier deal. Go meet with the dealer and negotiate the price for how many grams using the normal meter method and then transport it to your store house. After you've done this, you'll be able to go on the Miami Distribution mission where you give out coke to all your fronts. This is where you make the big money and the only way you'll get those expensive exotics. Other gangs won't be happy with this however, and they'll come after you in cars and even attack your fronts forcing you to defend them. Once you've collected your money, head to a bank to end the mission.

After you've been invited to the Islands and made a deal with "The Sandman", you'll be able to get even larger shipments from the islands. It sounds great, however there is a catch. You need to psychically transport the coke via boat to one of your storehouses. On the island side, you'll have pirates trying to kill you and on the Miami side you'll have border patrols trying to kill you, so it can be pretty tough. However it's worth the effort, as larger shipments means more money from each front.

At the very end of the game and after you've "bought" the plantation from "The Sandman", you can go to any storehouse and start a Miami Distribution mission, all for $500,000. No more hassle.

Save before attempting every mission
This is simple advice really – theres is a lot of money at stake and a lot of things can go wrong, so saving beforehand means you can just quit and go back without being annoyed that you're losing all your hard effort.

Keep your heat meters low
This cannot be stressed enough; the higher your heat is, the more gangs will come after you and attack your fronts. Each front you visit will increase your gang heat, so it can't be completely avoided, but make the start as easy as possible for yourself. The same goes for cop heat. The last thing you need is to be defending one of your fronts and then they turn up and you have to run away from them causing damage to your car. You can't decrease Gang or Cop heat in missions, so don't even try.

Vehicles
Choose a car that's both fast and has good amour. At the start you wont have them, but the Stampede and Bodog Stampede are good choices. If you can handle a faster car, it can be do in the Rattler, however in a Stampede you'll have more room for damage. Drive carefully but fast; if you've got the whole of Miami to cover, then that car is going to take a hell of a beating so try to not bump into things. Get used to the route you're going to take and make sure it's the best one. You can't repair cars in the mission so don't even try.

Fronts
If a front is being attacked on the other side of Miami, just leave it. There's no point rushing over there, causing damage to your car, and then you might not even make it. Then you'd have to go back to those fronts you missed. Use it instead as an opportunity: when a front is being attacked, rarely are you spotted by a rival gang, meaning you can collect money in peace.

Repair fronts and reduce heat after each run. Make it a point after each run to repair those fronts that were damaged and to pay off your Gang and Cop Heat; you'll still make a profit, provided you weren't completely useless.

Afterward
Buy exotics you want before laundering it to the bank to reduce their cut. You can end distribute missions any time you want simply by going to the bank, if you don't think you're going to make it then quit before you lose all that cash. Despite that, fortune favours the bold; if you can complete the coverage then the demand will increase for next time which means more money.