There are lots of guides out there on the web. The best thing to do is go to your local tracks and check out what classes you would interested in competing in. There are many variables to consider: Your age, budget. experience, and mechanical abilities. One suggestion would be the LO 206 four stroke if it is run where you want to race. I don’t think there is a program out there right now that can compete with the overall experience of this class. Ask LOTS of questions and have fun.