A quick suggestion as just read one thread here and I can say at least myself and one friend in my friends list had similar problems when we started last weekend.
But might be a good idea to put together a simple video and also guide that is just a simple quick start guide. Doesn't get into the real details but shows the program and how to race in this or that mode and such as I know that one friend said same basic thing that it was quick confusing at first.
So might be good just to do a quick start guide and video for those wanting to jump right in and then later deal with delving deeper into the game and such. Think it would really help newbies such as myself and others.
And then you could include the links to the video and guide in the welcome mail so new users know right where they can get quick help to start up faster