Samsung watch questions.

Thinking I might get a smart watch for my birthday. I've watched all the videos but there are unanswered questions.

It will be worn mainly on going to gigs. 

Will I be able to put my train ticket on the watch and also just one debit card rather than the multitude that are on my samsung phone?

If I can use the train ticket and  I'm queueing at the barrier with Wallet open and ticket visible would I be open to scamming on a credit card machine?

Google wallet requires that the watch has a passcode. Do I  need to put the passcode in every time i access time I use Wallet? 

What features are available without using the passcode? If the numbers are big enough to see without glasses I'd use it for sports duties.