Waterford-Dublin commute

[pixiebean22]

I am starting a month long (hopefully no longer than that) Waterford to Dublin commute on the 4th of October. I have gotten ticket prices (€154-weekly/€559-monthly, for anyone whose interested) but I'm just wondering am I able to buy my ticket at either Hueston or Waterford and if I was to buy my ticket at Waterford station, when is the ticket office actually open? I only ask this because anytime I have travelled from Waterford to Dublin (which is fairly regularly) I have never seen the ticket office open and I assume that I wouldn't be able to buy this type of ticket from the ticket machines.

Also, will my weekly/monthly ticket be valid if say I wanted to travel to a stop along the route? For example, if I wanted to travel from Waterford to Kilkenny and back will my ticket be valid? I hope so for the amount it's costing

Thanks for any replies.