Remember to use your first few laps to get suggestions, don’t worry about doing fast laps at first, you want to get your % setup as high as possible first. Use approx 16 laps to get the most hints possible in this part of the session.
In order to do this put your pace down to 0 or just above. Also make sure you set it to do the maximum set of laps per run. This way you’ll get more suggestions when each run is finished.
Then, when you do want to do the fast laps (say, the last two runs) put up your driver pace to around 100 (above this is possible, but it’s more risky in terms of driver errors). Also reduce your laps. The fewer laps, the less fuel you carry and the faster you go, but you’ll need to heat up the tyres as well so you have to find a balance.
Look at your tyre page and use the Compount Temperture Charts at the bottom of the page to see how long they take to heat up to 100%.
Using this info, go on your fastest lap, making sure you’re using the best compound (hard, medium etc.) for the conditions.