After the intro movie, choose the Campaign option to access the campaign.
You also may want to go to options and set the game to windowed mode so you can follow this HOMM6 walkthrough more easily
The first map is Griffin Bane
"Years have passed since the death of Duke Pavel killed by Demons summoned by the dying wish of the Orc Shaman Toghrul
whose tribe had been slaughtered by the Griffin armies. Now a young man,
Pavel’s only son Slava accompanies his aunt, Sveltana, in the mountains
of the Griffin Duchy to investigate signs of a new Demon threat."
Your hero will be Duke Slava. You can click on the bottom right corner of his icon to view hero background:
"Raised by his Aunt, the Necromancer Sveltana, after the death
of his father when he was only a boy, Slava nonetheless
managed to grow up a rash but good-natured young man.
Taking up the
title of Duke of Griffin when he came of age, Slava led a strong House,
and has five healthy, determined children who he is certain will do the
Griffin name proud.
The fact that the eldest one is a bastard borne by his first true love, Elisabeth -a woman the Emperor Liam forbid to marry- has pained him greatly.
Wars and enmities have taken their toll on him and his legitimate wife, Cate, and he prays to Elrath, the Dragon of Light, that the politicking that is beyond his control will not consume his family."
"There will be a short intro with Toghrul, and the campaign will start.
Sveltana will tell you that there has been reports of Demons and tells you to investigate. The Duke is reluctant since he does not believe there really are demons in the area, but you investigate anyway.
Demon Sightings
This will be your first quest: "Rumors speak of the presence of Demons in the mountains northeast of Eastalon. Sveltana has brought the young Slava here to teach him what he means to be a Duke of Griffin"
Active Objectives: Destroy the two wolf packs
0/2 destroyed
Rewards: +1000 Gold
+3 Wood
From the castle, head south towards the first wolf pack. When you reach the wolves, the Encounter menu will pop up. You can either attack or retreat. Click on Attack.
The wolves should be easy to defeat even at this level. You will also have some tips from the game
"Welcome to the battleground!"
Your creatures stay on the left side with your hero behind as support. The enemy creatures stay on the right side.
Unlike your creatures, your Hero can not move on the map nor be hit directly during combat. But be careful, losing all your creatures will result in defeat.
Each creature on the battleground actually represents a stack of creatures of a same type, the size of the stack being indicated by the counter just aside.
It is the first turn of the battle. In each turn, creatures perform their actions on the battleground in a given order. In this battle, the enemy creatures move first.
Enemy creatures have just acted. Now it's your Crossbowmen's turn to act. These units can perform lomng range attacks.
Left click on an enemy creature to attack with your Crossbowmen.
Now it's the turn of your Sentinels. These units can perform melee attacks.
Left-click on an enemy to move and attack with your Sentinels.
Note that you can also perform an attack with your Hero during a turn, but only once, and just before one of your creatures' actions.
Your Hero's attack button can be found on the command panel, at the lower right corner of the screen.
By defeating enemies, your hero gets experience points. When reaching a certain amount of Exp, your Hero will level up and become stronger.