If anyone is stuck and needs a good walkthrough, here is the one I used (Spoilers there, obviously)

http://www.rarityguide.com/articles/articles/2710/1/Skyrim-Dawnguard-Walkthrough-Part-1-Dawnguard/Page1.html

Should this not be in the hints and tips section...?

yeah sorry just noticed that forum now. Couldnt figure out how to move the post so posted it there