There is plenty of documentation for FlexNet available, and it's not hard to set up. If you don't have floating or registered user licenses available that is the first problem you must solve. That can only be resolved with help from PTC sales or an approved PTC reseller. Then you can setup Flexnet Server and proceed to update your single user test environment to have Arbortext connect to your Flexnet Server. Once that is working then Citrix should also work.
If you require documentation or training please contact PTC Support, PTC Sales, or one of the PTC resellers or channel partners.