To set up your development environment, follow these instructions.
After installing PX4, clone the repository inside your px4_ws/src folder and build.
cd ~/px4_ws/src
git clone git@github.com:Flying-And-Robotics-Club/farc-drone.git
cd ..
catkin buildThis will build your entire workspace. It should build without any errors or warnings. Source your workspace by either running source ~/.bashrc or opening a new terminal.
After finishing build, try launching the simulation. You can do this by running the following command:
roslaunch farc_drone_simulation single_drone_sim.launchThis will make a Gazebo window pop up with a single iris drone at the origin.

Now you can check your ROS topics, nodes, etc. needed for coding the drone control node.