first add bag stats
in item_template go to bag entry next if you want to add 2 stats set statcount 2 next go to stat_type1 and  set 45 for spell power next in stat_value1 set value (but in repack max is 32767 for more compile new core) next stat_type2 set 30 for spell haste
and value in stat_value2 maxstatcount  is 10 and if stat are not showing in game delete cache
you can find stat type in itemtemplate.h in google
Second for spell you need to modify Spell.dbc and create custom patch
and Third for hit you can add stat mele rating  or modify delay in item_template