Flies generally should be trolled as slow as you can go. If there is some a breeze that will allow you to drift over the area of the lake you want to fish, drifting with the wind can be deadly. Just row enough to keep the lines straight. If you drift or row, remember your lead line will be sinking deeper and to start out with less line out. The flies can be trolled with your motor as well, but keep the speed as slow as you can.
Many people drag a bucket or sea-anchor when trolling flies to slow the boat down.
As flies have no built in action, be sure to zigzag to make them appear more lifelike. The log should not only contain information on what you caught, with what and when, but weather conditions, time of day, and speed you were trolling, depth of water and lure. Many of the regulars keep notes attached right on the map of the lake. It can be a place to start the next time you go fishing and the conditions match what you experienced before. Be observant of your location when you hook a fish, line up reference points on the shore and repeat the same exact trolling pattern on your next pass.