You must take out the incoming waves of Lost MC biker gang members. Keep taking them out while in cover from all sides of the roof.
Use the explosives to your advantage to take out hordes of them. The mission isn't difficult, and you should be able to complete it in no time.
After taking out the enemies, talk to Dax, the main character of this DLC, who will join you in your Acid Lab business following the First Dose missions.
Dax will ask you to recover his van, Journey, from the Lost MC biker gang. Leave the bar roof, and get into the boat at the dock nearby. You can see the icon of the boat on the map.
Go across the lake and infiltrate the Lost MC biker hideout. Eliminate the enemies and recover Dax's van.
Drive it back to the bar, and pick Dax up.
After that, go to the abandoned warehouse in Los Santos. This abandoned warehouse will become the headquarters for all your Acid Lab business activities. It will now be known as The Freaskhop.
This concludes the first mission in the First Dose series. With the introductions made and The Freakshop established, you're ready for the next mission: Designated Driver.
