For str dekan the build is full str , or 3 str and 1 vit do what you like best next is the skill tree:
Dragon fighter************Dragon knight
1-3 Unique/Ancient: HP and MP Absorve alot of str and vit dont put melee because at low lvls you dont have alot of melee so go with str till the 3 unique/Ancient but at the 3 weapon you can put melee if you whant.
4-6 Unique/Ancient: Damage Drop ,melee and str and vit to help.
Str crit dagger: ALOT of str and melee and crit%.
Armor sets:try to do all enchanted armors if you can.
Enchanted froianne/Pluion: put good phy def and put damage reflect because low lvl monsters dont hit so much.
Enchanted Edwin/Bedron/Serpent Split: good phy def and max hp so you can have good HP.