i was under the impression that each class had minor specialities you could choose. for example, i want to pick ranger, but i was led to understand from a game guide that i then had a choice between something like Archer, Stalker, and Beast Mastery. i'm not seeing the option to choose these subclasses anywhere. also, i read that you could "reroll" and get a higher number of points to distribute, but my rerolls seem to just redistribute the points and not give me added or lesser points.
Vanilla BG 1 doesn't have kits.
Hitting reroll is rerolling each individual stat. The total number of stat points may be higher, lower, or the same as your previous roll, though your rolls are likely to mostly fall into a somewhat small range of point totals (70's to low 90's). That 17 being in your Wisdom instead of Dexterity after the latest reroll doesn't mean the two stats were swapped, just that Dex rolled a 17 last time, and Wisdom rolled a 17 this time. Also, different classes have minimum values in different stats; if the stat rolled was less than the minimum, then the stat is set to the minimum (or possibly rerolled until it isn't below the minimum, I don't remember which). Iirc, Rangers have the highest minimum stat values, so you'll see less variation in stat values while rolling a Ranger.