So I just went ahead and bought the founder pack DLC On Steam.
I haven’t played ToS before so, will registration open on 29th March and will it be through the client?
u login with ur steam account
- Founder’s Server Open : Tuesday, March 29, 2016 02:00 AM (EST)
You’ll be able to launch the game through steam, yes. 
Oh is that it? Thanks for the quick reply! 