Every new club gets a 14-day trial with full access to everything. No card is required to start, and there are no feature restrictions while it runs. The trial begins the moment you create your club, not once you've finished the rest of onboarding, so it's worth getting your squad and fixtures in early rather than leaving it to the last few days.
Once the trial ends, your club moves to read-only until you subscribe. See What happens if payment fails or you cancel for exactly what that means for your data.