single player

[dvdljns]

I only play single player and am new to d1. Most of what I know is just from playing the game and learning as I go along. The websites seem to be aimed at leval 30 or higher. I am not there yet or close. my aproach is to build one of each charector and play it straight through and build other players to use as learning tools. like build a rogue and do nothing except add to dex to see how for that gets me so on and so on. What I would like to do is speed up the learning proccess. What do I need to open files with an sv extention. levaling up five points at a time is a slow way to learn.
I do not know if this makes a deferance but I have a retail version with nothing added. I've never downloaded any patches or anything to it.
Can anybody help me.