Hi everybody!

Could you recomend me a scenario for testing 0xp decks?

Midnight Masks is the earliest scenario that challenges you to be able to solve clues, movement, enemy management and unusual conditions while under a strict time limit. While it's more intended for decks with 6-7 exp, it's perfectly doable with modern level 0 cards. It also gives you a more granular metric than just win/lose, since you can count how many cultists you dealt with before the end.

Otherwise, I'd say Curtain Call for Carcosa is a relatively straightforward starting scenario with a balance of investigation and clue gathering.

However, it really depends on the campaign. The Witching Hour for TCU and The Untamed Wilds for TFA are perfect introductions to what those campaigns require from decks - if you struggle in those scenarios, you'll have a tough time with the campaign as a whole because your deck likely isn't suited to the campaign.