Paid Subscriptions but after a FREE trial

[Iron Guard]

Hi,

I am planning to put some forums and ability to add avatars and images under a Paid Subscription plan.

However I would like users to try this subscription FREE for a month (or any other fixed interval), when they register, before actually paying for the subscription.

Now can I do this on vbulletin?

Can we disallow access to paid subscription features (avatars and some forums) after the free trial period is expired and ask them to pay to continue using those features?

Thanks for your help.