New player here, don't know how to spend coins.

I've played the game for about 2 months, and I have 820 coins right now. But I don't know what to do. Should I...

1) Spend them for player packs (like Messi, Neymar pack).

2) Just gamble all of it. Honestly I'm always scared to waste hundreds of coins just to get NOTHING.

Well, I know this isn't a question you can answer directly, there are some factors like luck. But I wanted you to share your thoughts.