First, figure out what brings you flow already and think about how to maximize those moments. Dan Pink offers an excellent exercise to help with that:

Via Drive: The Surprising Truth About What Motivates Us:

Set a reminder on your computer or mobile phone to go off at forty random times in a week. Each time your device beeps, write down what you’re doing, how you’re feeling, and whether you’re in “flow.” Record your observations, look at the patterns, and consider the following questions:

• Which moments produced feelings of “flow”? Where were you? What were you working on? Who were you with?
• Are certain times of day more flow-friendly than others? How could you restructure your day based on your findings?
• How might you increase the number of optimal experiences and reduce the moments when you felt disengaged or distracted?
• If you’re having doubts about your job or career, what does this exercise tell you about your true source of intrinsic motivation?

Second, do your best to take your regular work activities and add in the factors that create flow.