When I write an introduction, the main thing I aim to do is introduce the argument - the point of contention as it were - however it is important not to argue your case within the introduction. For example if your position toward a question is ultimately 'there is no absolute truth' then you'd say this in some form in the introduction but not bring evidence in to support it as you leave that for the body.
Another thing I attempt to do is demonstrate (briefly) how the argument is important/relevant to the topic/question. For this purpose many students include a rather generic statement concerning their module.
It is also up to you whether or not you include the name of your texts in the introduction - less practiced students generally find it easier to list the core texts they'll be using within their essay. However if you find you are able to write a strong argument that is not disrupted by introducing texts as needed then go ahead, just be aware that at 2u level most students aren't really capable of doing so which is why it is generally reccomended by teachers that you introduce your texts in the introduction.
