Tips on Buying Cars: Any Tricks about Buying A Car, 2006 nissan altima, nissan altima

Question
I am looking to buy a car. I am not sure if I want a new car or a used car. Do dealers charge more on new cars than used cars. What should I do before I meet with the dealers and what should I bring with me.What can of offers will they give me if I am looking to buy a 2004-2006 Nissan Altima and a Lexus IS&GS 300. How do I get a good deal on payments and financing.I am sorry to ask you soo many questions but I don't want to get rip-off and pay too much money on one old or new car.

Answer
You first need to educate yourself about the buying process.  One of the best sources for this kind of info is on Edmunds.com.  Click on the following link:

http://www.edmunds.com/caradvice.html

Read through the applicable categories to get a general idea of what you need to know.  Then, please check back here with specific questions that I might be able to help with.