After you buy weapons or vehicles they are placed in a short term storage warehouse until you bribe a ship captain or cargo pilot on their way out of the country. When you are starting out you are at the mercy of their manifest and must choose to disembark at one of the ports along their route to sell your goods. Later, once you have amassed a small fortune you may purchase your own vehicles to use, each with unique benefits and drawbacks. Sometimes you will still want to use the random cargo vessels to blend in or as part of a clever strategy you might want to try.
The weapons trade is a grey market industry. It is neither legal nor illegal, but is often both. This is the sort of paradox that billionaires deal in and is policed by ethereal organizations like Interpol. Interpol investigators will be hot on your tail almost from the start. Luckily for you, they are few in number and must follow a paper trail across the seven seas and the airspace of the entire planet. If you become predictable, lazy or complacent, they will find you and break you. Once caught you must decide between walking away from all of the money and prestige or an extreme prison sentence in a nameless region of a dusty nation.
Life as an Arms Dealer isn't all about buying low and selling high. You will receive special requests with unique rewards. The requests will also offer additional bonuses for meeting specific requirements. For example; A request for 12 crates of assault rifles of tech level 3 or higher with a bonus if the origin country is Russia. The player will receive the bonus if he an provide 12 crates of AN-94's. Luckily he stashed 20 crates of those when his deal fell through a few months ago due to an outbreak of peace.
Speaking of peace(spits), a smart businessman knows that if demand is low you need to take action. There are certain organizations that can apply pressure or create situations that might help an international dispute boil over into a conflict, or perhaps create an uprising leading to civil war. They will need weapons. Both sides.
Playing like this can be dangerous and you have to be careful because every country has friends. When dealing weapons to members of an alliance you will make everyone in the alliance happy. However, supplying the enemy will cause everyone to turn on you. Supplying nations have nations they favor and nations they despise as well. Keep them happy and you will gain access to the upper tiers of their wares, but prove untrustworthy and you will find your selection or available stocks low. Obviously the suppliers also don't like you being cozy with other suppliers so you will need to balance many relationships and utilize complex strategy if you are to succeed. Speaking of succeeding, your contact has told you that if you can amass 30 Billion dollars that you will gain access to your family's "birthright". You are skeptical and think it sounds like a ridiculous scam or silly plot mechanic, but then again, $30 Billion dollars is as good of a goal as any to have. Rumor has it that your father was close to that goal before he presumably died off the coast of north western Africa.