Personally, I like to engage in cleansing and charging rituals whenever I first get a new Tarot deck, to ensure that I'm working with a blank slate. I start by blessing the cards, drumming and chanting over them, and smudging them with sage to clear any residual energy from previous owners. Then, once I feel like they're clear, I'll charge them by placing them on top of a piece of selenite and leaving them to rest for a while.
Finally, I'll dedicate an evening to getting to know each and every card. I'll shuffle and then mindfully lay out the cards, often in something like a Celtic Cross spread, and take time to focus on the images and interpretations. This helps to give me a better understanding of how I personally interpret each card, and helps to begin my journey with my new deck.
I'm excited to hear about the deck-bonding or maintenance rituals all of you use!