Jimmy Doug
If you know what's good for you ...
The above is precisely the sort of thing you should expect - although there are less undulations on the East of Beauvais than the West - you can expect small hills, a tail-wind (unless you're unlucky), and lots and lots of fields. Someone suggested coming from Calais rather than following the old rail track from Normandy. Personally, I think this would be a shame. Normandy is far prettier imo, and routes following old rail tracks tend to have moderate gradients at most. Don't worry about it - I'm sure you'll find it easier than you expect and you'll have a great time!