This will vary a bit, especially near the start of the game when you need to meet various equipment requirements, etc, but on average over the course of the game, people playing warriors put about 2 stat points into strength per level, 2 into agility and 1 into constitution (completely neglecting intelligence).
Like Doomreaver said, warriors should easily be able to rely on equipment bonuses (and maybe an occasional potion) for what mana they require.
differences between classes (minor spoilers)
Early Starter Tips (NON-Spoiler Version) (contains much of the information in the above topic)
Once you switch to
restoration potions for healing (primarily), you will also get your mana boosted whenever you drink one.