I don't know what format you use for the date. July 03/08 is one I have not seen before. July 3, 2008, or 3 July 2008 are more familiar to me. However if this is your convention, then use it as you have written in.
Usually you state how long your leave will be. One week, two weeks, etc.
Do you "advise" your boss that you are taking leave at a certain time, or do you request it? If you advise him/her, then
I would like to let you know that I have scheduled my annual vacation for [two weeks - whatever], starting on 3 July 2008, when I will be getting married.
I am totally unfamaliar with informing your boss of your expectation for a bonus and pay increase due to marriage, but bonus requires an article ("a"), as does company ("the"), and company should have a small c. Perhaps you want to say "due to my change in my family status" because the company is not the thing that has the family satus.