This may help you to get an overall impression what is important in the game:
http://forums.d2jsp.org/index.php?showtopic=24496799&f=74The main thing apart from the right stating to climb fast is good gear, which costs more the better it is of course.
But with the right knowledge and some effort, you can improve slowly but steadily

Additionally, this guide should help you on the barb:
http://forums.d2jsp.org/index.php?showtopic=18377324&f=272It is ok for starters who do not wish to ( or simply cant ) invest anything or just a bit.
BUT, investing low results in lower speed.
If you want to kill faster, you need to invest fg.
Especially if your aim is to do wells in the higher levels e.g. to mf, a magician or caster rogue is the better choice.
You can check here for some character guides and help on mechanics:
http://forums.d2jsp.org/index.php?showtopic=18560908&f=272