Old english is virtually unusable, it had a completely different alphabet. The next best thing would be Middle English. To help I would do some research on the writer Chaucer who was of that era.

Example of Chaucer's writing:

Middle English - This frere bosteth that he knoweth helle, And God it woot, that it is litel wonder

Translation - This friar boasts that he knows hell, And God knows that it is little wonder

If thats too much, then I'd go with the Early Modern English style of Shakespear, which is a little easier to understand.