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Fierro, the beginning is the most challenging. If you manage to break through the forest along the road, it will get easier and easier. On the road from the first town to the second, there are only two enemy groups, so you can focus on these battles – use the potions you find, rest in the tavern (if you rent a room in the evening, you can sleep there for 3 turns, gaining a total of +30% health). It's best to sell resources and artifacts early on to invest in your army. A couple of Paladin units that heal each other can hold the line well, and archers are also good at dealing damage.