The transition from Old to Middle English is a huge topic. The only way in which it can be effectively tackled in a single paper is to take the central premise and make reference to one, specific feature. In this case the example will be the changing figure of Christ.
When looking at this problem useful texts to bear in mind are:
"The Wanderer", "The Dream of the Rood" and "Medieval English Lyrics".
Remember that whenever one is dealing with early literature we are looking at a blend, and combination between pagan and Christian elements and cultures.
Heroism and comitatus should be discussed in depth as they are the foundations of Medieval culture.
Always bear in mind the distinctions between the Old and New testaments. Remember the conflation ...
The transition from Old to Middle English is exemplified.