Hard mode tips and techs

Hi! Iam new on merchant, actually farming for t4 in standar game, yesterday started hard mode, so im looking for tips and techs for this dificult. General questions i need to know, how many heros is the ideal for start up, is a good idea farm to get jewler and enchanter on early game?, and i craft goblins equip like crazy for prefix and subfix is that right? Thanx you for your time(is farm time xD)