Once you have completed the quest Who Dares Wins, you can accept the quest by talking to Scribe Rothchild in the Citadel Laboratory. You can get started by finding some cameras and sensor modules. These items can be found in most toolboxes and near workbenches. Once you have obtained at least one and preferably as many as your carry weight allows (for efficiency's sake), you can return to Rothchild for a reward of 100 caps and 25 XP for every camera. For every sensor module you turn in, you receive 75 caps and 10 XP. These are not awarded until after exiting dialogue with Rothchild.