Thy first experience should be invested in Sword, Attack, Parry and Tactics, since these are the primary skills needed for battle. Once the cost of either of these equals the cost of one Hitpoint, raise Hitpoints until its cost exceeds that of the skills'.
When thou hast raised Sword, Attack, Parry and Tactics to about base eight, thou canst gain from also raising Intuition, Agility and Strength. Once thou art battling mages, thou shouldst also invest in Immunity.
Invest thy first experience in Bless by raising Bless one point followed by Bless (again), Dagger or Staff, Lightning Flash, and Magic Shield. These are the most important spells and skills for the first few quests. Once the cost of either of these equals the cost of one Mana, raise Mana until it exceeds the cost of the spells. Once thou art battling mages, thou shouldst also invest in Immunity.
A mage is very difficult to play, especially in the beginning, but it offers many options and a variety of gameplay that a warrior can never reach. Remember to always bless thyself and to activate Magic Shield before engaging in combat.
You can try to form alliances with other players to face the many adventures that await. An alliance between a mage and a warrior will be much stronger than an alliance composed of either two mages or two warriors.
When exploring the world, you will do well if you always carry at least two torches, one recall scroll and a healing potion.
Also, it may be a good idea to be brave and ask other, more experienced players for advice and guidance.