There is no set route - you just have to go through the checkpoints - that's half the fun of the race!
Going over the top means a steep climb but then fairly easy running into Carlton Bank. Going through the woods can be very wet (although it was ok last weekend) and a bit confusing, but there are no really steep bits. I'm still not sure myself which is the best / quickest way to go.
You can get as much help from support teams as you want. We try to get buddy runners along for the 2nd half as it really helps to keep you going.
I've done this for the last few years and am running it again this year. You've chosen a pretty hard one for your first ultra, but it's a great race.
Have you had chance to reccy any of the route? If not I would try to do so as there are a few spots where you could go wrong - and extra miles in a 42 mile race are not a lot of fun.
There aren't that many steep hills, but make sure you walk them or run/walk from the start.
Apart from water at all the checkpoints and rice pudding and peaches at the Lion Inn, there is no food, so you have to be self sufficient. Make sure you start eating / drinking early in the race. If you're like me, you won't be able to digest anything in the later stages.
Even with the dry weather, be prepared to get wet going through the bogs from the Lion Inn to Hamer - I went in up to my chest last year!