Welcome to the forums.
You might be wise not to raise both your extended leave AND a pay rise in the same e-mail. Also, will you have to offer to take your leave as unpaid leave?
For the first:
I am going to be returning to work on 17th December. However, I have already committed myself to going away at Christmas, and will therefore need to take 27th/28th December as leave/holiday. I hope this will be acceptable.
For the second:
In the New Year, I would like to arrange to meet with you in order to discuss my salary. Please let me know the best date and time for us to get together.