Keep away from monsters: it's already pretty hard to survive on your own in the plaguelands, especially when it is swarming with monsters. The monsters grow in strength as you move to the areas with thicker miasma. You are protected by the system when you are in lower miasma level but if you go to the difficult areas, you will not make it past half an hour and turn to an undead, failing the game.
Armor and house: You can choose to stay still on a land and try your luck in making your own everything or move alongside the sun. Both ways are good for survival. However, being in one place makes it easy for the hunters to spot you and kill you. There a decree in the whole world to kill anyone with potential to become an undead and no one believes the survivors have a certain degree of immunity from the miasma.