Just in case anyone doesn't see it in Driver Chat, this is the newbie guide info' posted by Super Aguri's team leader.
1. Have you already got a team mate? Look in the Office>Team Talk, see if they have posted their setups for you.
2. Go to Garage>Car Setup. Click on the Engineers Advice link and make a note of what it says
3. Go to Garage>Car Setup and do your practice runs. Use the Engineers Advice to help you set the starting positions for the sliders. After each run you get feedback on which way you need to move the sliders to get closer to the ideal setup. Consider how high you want the experimentation level set - the higher it is the more feedback you get on each run, but the higher the risk of a costly practice accident.
4. Once the Practice session is over, go to Garage>Quali Strategy and set your strategy for the three qualifying sessions. Remember that the system is the same as in real F1 - top 16 progress from Q1, top 10 from Q2. Also remember you have a limited number of tyres which have to go through another round of practice (the pre-race Warmup) and the race itself, so use them wisely.
As and when the teams fill up you can share setup information with your team mate and fine-tune your setups at any time before qualifying.