One of the legal jobs you can become is a Courier. As a courier, you can make 10% of the cost of each order. Orders can be placed by an individual through the smartphone "Delivery" application or by a shop in the city such as Jennifer's.
There are 2 Courier slots open at one time. If you hit the tab menu you can see if there are spots available on the top of your screen. If there is an open position, head over to the business area and take a left on Flobers St. Take an immediate left onto Harbour Lane and proceed down the ramp until you reach the yellow warehouse.
You will see an NPC standing outside that you need to speak with to join the job. Once you have accepted the position by talking to the NPC, speak with them again to spawn a Courier van.
When you receive an order, you will receive a text message on your phone from the phone number "910-51011". The text message will give you details about the order including how much the order is for, and where to deliver the order to.
To pickup and prepare a package, go into the yellow warehouse and you will see a courier package in the middle of the warehouse. The package will include the price, who the order is for, the person that ordered the item's phone number, and the location to deliver the package. Once you see the package, take out your fists and right click on the package to pick it up. You will then carry the package to the back of the courier van. Once near the back of the courier van, jump into the back of the van with the package and head to the back. You will see the package then automatically go to the back of the van. If you have multiple orders at once, go get the other packages to save yourself multiple trips. Carry the other packages to the back of the van and you will see them stack on top of each other once you put the package in the back of the courier van.
Once all of the packages are in the back of your courier van that you need to deliver, start heading to the destination of one of your packages in your courier van. Once you arrive at your destination, park in a safe area and turn the vehicle off. Once out of the courier van, go to the back and jump inside. Hit "E" on the package and you will see a menu with all the packages currently located inside your courier van. Select the package you would like to deliver. It will put the item in your "weapon bar". You can select the package by hitting "2" and left clicking on your mouse. If you are delivering the package to a store, head to the store NPC and choose the option to deliver the package. If you are delivering the package to a person, and need more information about the package after it is in your "weapon bar", look in the bottom right of your screen and it will show the cost, who you are delivering it to, and the phone number of the individual. Once you get near the person you are delivering it to, hit "2" on the "weapon bar" and left click to drop the package. Once you deliver the package, you will get a notification in the bottom right of your screen with how much money you made!