Sounds a bit like Brentwood half if anyone has done that. Downhill at the start then last bit is uphill. Not the most fun but you are so close to the end it doesn't really matter especially if it's your first 1/2 marathon.
Also people who think that just because I run I should be doing FLM every year and think that I'm not a serious runner because I don't even though I'm not old enough yet!!!