I need a laptop but have no idea what I'm looking for?

I really will only be using it for surfing the web and playing on line games, I use Facebook and play games on there so need something that is quite fast (I think?) as playing them on my PC they load very slowly.

I have seen this one and it seems a good price at £299.99, but have no idea if it is any good.

Acer 5742Z Laptop, 4GB RAM / 750GB

Any help would be much apreciated.