Have played the game in previous beta tests, and also enjoying the current one. So far, it was really great to experience the game and hope there'll be more from development team to try in the future ^-^
If you about to start the game yourself, make sure to get familiar with characters and their unique abilities first, and then get to know some basic skill combinations. That would help you to grind better during the gameplay.
After you play for a while, you'd be able to play while using different strategies and deck builds, and enjoy various modes the game has to offer ;)