I want to buy a laptop ...see details please ..?

Best option is a Macbook Pro. Then install windows on it so you can play more games in something familiar. You can buy high end laptops from Alienware, but they cost much more than the macbook pro which comes stock with 2 deticated graphics cards and 4GB ram. You cant put a graphics card in a laptop, so you stuck with whatever you have. 4GB Ram is fine if you are doing games. You will most likely not run too many things at the same time, so you dont need 8GB.