For Melee-
When your at lvl 55 with your gear on you want your dex to be around 100ish. 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 this is just very general