diablo fan said:
is it the thing u can hire?
Yep, Mercs (or hirelings) can be recruited in each of the acts (excluding act 4). The mercs that are available are:
Act 1: Rogue Archers (talk to Kashya)
Act 2: Desert Guards (talk to Greiz)
Act 3: Iron Wolves (talk to Asheara)
Act 5: Barbarians (talk to Qual-Kehk)
The earliest you can hire a merc is either after completing the second quest in act 1, or after reaching level 9.
diablo fan said:
and they help you kill stuff?
The mercs follow you and help you kill stuff.
diablo fan said:
and can u give your little helper a different weapon? and how?
You can equip mercs with weapons and armor, by opening their inventory (the shortcut is 'o', I believe) and placing armor and weapons like normal. Keep in mind that certain mercs can only wear certain equipment. For example, the act 1 rogue mercs can only equip bows, body armors and helms.
For information on the skills that the mercs get (or anything else for that matter) check out
http://www.battle.net/diablo2exp/basics/hirelings.shtml
Best of luck