[Radek]

1. Ignore the predefined classes - each of them will always contain something that will not suit you. Create your own class (that means, "fill the form yourself").
2. In fact, it does not matter which race you will select for your class. You can develop any race according to the same plan and get a hero with the same abilities. The starting skill bonuses are only a temporary matter and their significance will vanish soon. They only decide which kind of problems/advantages you will have in the beginning of the game. On the other hand, the class/birthsing abilities, powers, and spells are important.
Therefore, select a class/birthsign, which suits you best as far as powers, etc., are considered. For a fighter/mage character, you can select a dark elf or a breton (naturally, even a breton can become a superior fighter if you will develop him such way) and give him the mage birthsign. You can also try atronach (a sorcerer) but beware of the inability to regenerate mana points, there are no "mana refillers" in Morrowind as we know them from Daggerfall - on the other hand, the 50% spell absorption is a powerful and never-vanishing ability. Note that the spell absorption in Morrowind is a "divine spell absorption" - you can "absorb" mana points even if you are fully saturated with mana - such mana points will not add to your mana points but the absorbed spell will not harm you. In the other words: 50% spell absorption = among others, 50% spell immunity. I cannot recommend apprentice because of the weaknesses of the apprentice and overpriced resistance spells in the game.