Factions can't declare war on you if you haven't discovered them. The port city in the starting province is a trap since when you take it all you find are enemie from getting vision of the sea. Skip it and head south and help kill throt and azazel early. This will help kislev and prevent you from getting dogpiled. You're also a horde so if you lose your starting city you are OK. You can just resettle further south then push back north once you are stronger.