by contiguity
Let me reiterate to you or others to not read the quick start rules. Read the complete rules (see above).Also, the "already constructed deck" method is more likely to be a good deck than one a new player had to make from what they opened. They made a starter set which has preset decks if you're not sure. (Might have to wait for it to be back in stock.)
If you still have rules questions, I would just search the forums or ask if you need help. It's easy to miss things when learning a new game.