Armor - Stam coli, stam/luck enchanted
Acc set - stam/luck/str, your choice which
Pet - Gumiho (if astro pet), you can get a dryad later when you start boss farming seriously
TDD's effectiveness varies by the enemy your facing. High defense enemies will be affected more by it. Low defense enemies will barely feel a difference.
Stam/luck is consistently suggested because it really is the no-fail way to enchant normal armor. Experiment as you wish though.
Triple stat'ing is possible, just difficult. It requires near-perfect starting pieces and a lot of puzzles.