Hello.
More then a answer to your question, I would like to salute you, and wish you good luck.
By myself, I like to make racaing games, so, theres isnt much to think about.... tracks, which type of cars... things like this.
I think there are already some documents lying around the forums about it, search and you probably will find some good information from more experienced users.
If you are new to game development, start with something simple. People sometimes start creating theyr first game, and they want creat a MMORPG.
Hope experienced users can help you with your questions and doubts.
Good luck, and welcome.
Cya.