how do i have to manage the 7 days Test membership. I got 4

Hi,
how do i have to manage the 7 days Test membership.
I got 4 subscriptions.

7 days Test
30 days
180 days
360 days

Normally i want the User First to Test My membership. So everyone should get a 7day Test membership. But only One Time.

I dont know how to Set up this.

What if a User already used his 7 days...will he still be able to choose the 7 days Test membership?

Cheers,
Denis