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What advice can I give you:
1. Develop quickly and conquer everything, level up your heroes.
2. Start with a Crag Hack, or if you're having trouble, try a Terraform (special acceleration; you'll quickly gain Air experience and Mass Haste, and you'll also have a high chance of getting Tactics).
3. Play actively: capture mines, gather resources, and level up your hero.
4. If you're playing on a map with a Castle, you can afford to get Bears by the first week, and then just don't upgrade them; leave them as regular units. With a dense map, you can get quite good troops relatively early (all 6 types are upgraded; don't touch the 7th, Bear, until you have a lot of crystals).
5. If you don't get anything good from the Magic Guild, that's when things get really interesting.
6. While the AI is setting up its Titans, you'll already have a decent number of Bears. Then, when you have a lot of crystals (you've built everything, exchange all resources for crystals on the market, and the rest for gold).
7. You need to aim to reach the final battle with your main heroes. If you have a Terraformed hero with Mass Haste and Tactics, it's simple: bring everyone forward, but not too far, so as not to be in direct line of sight of the archers. After his turn, immediately use Mass Haste and attack with everyone. First, you need to eliminate the Naga, the archer block, and then everything will be fine; in close combat, the Barbarians pull the mages