babark: Wait, so as a person who has almost never played an RPG where there is the option to play as a magic user as anything other than a magic user, you're saying it is better to play melee in BG?
Should you make a spellcaster, hide behind other group members. A pure spellcaster CAN'T solo. Beware... Also, pure starting spellcasters have extremely low HP and can be killed by one hit from pretty much EVERYTHING, from a gibbering to a wolf to a bear... You have extremely limited number of spells to cast per day, they need memorization and before you can cast again, you have to REST, of course without being ambushed. IF the spell succeeds depends on an unseen dice roll, as well as the extra effects (if any), the enemy's resistance added in the mix, plus enemy ROLL of dice too, for either foiling spell altogether (like instant death ones), or taking less damage, or avoiding special effect. Spellcasting is a science in Infinity game engines.
Better start a fighter human and dual to mage later. Ideal level to do so is 13. You can earlier, though, of course. 3 or 9 sounds good, too. Remember to use a group. If not, then choose a multiclass, like those classy dwarf fighter/clerics, for example, all times classic and in BG1 original, probably the best character (to solo and not only).
If you play EE you have even more choices, like classes from 2. Wild mage can work well, too. Too bad they "nerfed" it and "fixed" its broken OP spells and combos.