Way too broad a question. People literally write PhD dissertations on just small aspects of this topic!
I would suggest restricting your title to a given text or set of texts or author, and specify the critical approach you will be taking (presumably a queer theoretic one, but you could just as well explore texts incorporating homosexual themes from other approaches too, potentially quite fruitfully!). That should help narrow down things a bit. If looking at a set of texts, carefully consider what time periods they are from - if you are assessing a range of contemporaneous texts your approach will probably be quite different comparing e.g. a present day text with an older text, so this may inform what critical approach you take to them.
Have you decided which text(s)/author(s) to focus on? I wouldn't suggest more than three texts at most for something like an EPQ, as otherwise you'll probably end up with too superficial an analysis - even three might be challenging to juggle. Also note that if you want to write on literature in translation, you will probably need to dedicate some space to discussing the issues and limitations of translation particularly as it relates to homosexual/homoerotic themes vs the cultural institutions which may shape a translation.