For Melee-
When your at lvl 55 with your gear on you want your dex to be around 110-120. Put the rest of the stats into strength
For items-
Weapon- Enhanced Effect( the higher the better)
Armor- For catacombs look for heavy armors with EE. For arena look for heavy armors with stats such as strength or dex
For charms- Look for stats such as strength or dex
lmk if you have any other questions
if your refering to this character:
http://forums.d2jsp.org/user.php?c=3&i=573699&p=293227 you are using a lvl 5 sword at lvl 24, upgrade to a lvl 20 wpn or get a 25 once you get there.