Is this normal?

Guys recently when I opened a premium pack single one( I'm a beginner that's why) luckily i got a hero it was I immorticia i can't believe my eyes then when I opened a another pack next morning I got grass knuckles. I was so damn happy and felt blessed but as I'm a newbie I don't have any legendary cards and the deck I currently use is aggro boogaloo which involves unlife of the party and flamenco. What should I do with these heroes should I build a deck around them( I'm not very well at it) or should I just continue with boogaloo I'm really stuck guys help me out..