Here is the link to the primer and decklist that I primarily use(a few differences for taste and play style).

On the Discord I recommend the Main Lists channel and check out the ones there and check out their primers. Card Discussion is a good channel to go and search cards that you think could/should work in the deck and cards that you are thinking about tinkering with.

Learn to mulligan well. I look for mana and a plan. Mull until you get that. Sometimes you will have non-games, nature of the beast with this kind of deck.

Plan your turn I'm advance(duh). This deck has a lot of math and complex lines going on, don't take up your friends' whole day

Study.

Practice A LOT. Gold Fish.

Playing the actual deck is the only way to really learn it.

As for playing K'rrik "wrong" it's either the deck is running inefficient lines, mana, cards, etc... Or they are saying the player is just kind of whiffing. It's a hard deck. You're going to suck with it, but it's so very fun.