Uhm, Turkish are one of the hardest faction to play, because of limited income issues.

But Horse Archers are most devastating units in the game, and my advice is disturb the enemy stacks every turn with them. If you face with long range archers, charge them, but stop before hitting, that will distrubt their position, so they will stop firing. Also, you can chase down any routing units.

That way, even you lose the battle, enemy will suffer casualties but you will not. And sieging with Horse archers can be good, courage the enemy to sally and crush them with encircling them.