I have 2 domains oldcarz.net and newcarz.net. I would like to do something using this domains so that can get relatively good traffic. May be use google adsense... I want something so that user get some info from both these domains. what would you suggest... forum or blog... or simple 4-5 pages site with relative site links... or something else?
No offense, but those are terrible domain names. You would need to create large, unique and high quality websites to have any hope of making money. A simple forum, 4-5 page site or blog wont get you anywhere.
i suggest u create a blog about car and make traffic... when you get high traffic, try to apply advertisement compony like payperpost and so on.... p/s you also can place GA on there but are the keyword is good?
I would say a blog would be the right choice. You can adding additional info anytime you want plus there are a lot of wordpress plugin that can help you in SEO.
Find a keyword or phrase in your catagory that has low competition (tough one) ie less than 50,000 pages then optimise your domain content to that keyphrase. You are always going to be up against it in this highly competative market. Your content is king in this case or another suggestion is to use it a squeeze page site to send free traffic to build a list.