You also start out with 1000 gold, a large fortune, but try not to waste it unless mercenaries are desperately needed Your kinsman also controls the County of Eu, and one of your half-brothers is the count of Mortain as well. You have 3 sons and 4 daughters, all of which are not adults yet.
Your eldest son, Robert, is already Count of Maine. Beaumont is of little use to you, but keep it to help revenue until you finish your war. William starts out with only 3 titles, Duke of Normandy, County of Rouen, and Baron of Beaumont.
When starting out as William the Conqueror, you face several challenges in your quest for the throne of England.
There is already an article on playing as William the Conqueror, but it is slightly outdated, with new updated and different AI reactions.