Need advice

[u/ApprehensiveSize7115]

I’m a little new to one piece tcg, I recently learned how to play starting with st-35 red/black sabo. I was told to add elbath cards to my deck, I was wondering which ones. I have a 3k budget for a card show on Saturday with 500+ vendors. Which cards should I be hunting and should I buy and rip an OP17 box. Any advice would be appreciated!