There isn't a practice mode but you can test weapons at the weapon shop. Matchmaking is kinda brutal.

Lol Luca we just had a game didn't we? I guess you'll have to learn the hard way :}

really just play. trust me you will be used to the game after

Oh yeah we did lol, I promise im not that bad lmao

You will get better as you play. You get more gear that also has abilities chunks and there's a lot of weapon choices to unlock too.