The free trial can be converted to a regular account anytime after the first day. When you buy the game you get 30 days paid for before any additional subscription kicks in. This cannot be accelerated but there is no reason to accelerate it.

I can't quite figure out the problem though - free trial, 30 days after buying the game or regular subscription makes no difference to creating a new character on the server you want to be on - it may take an hour or two to get back to your current level.