If "caught" by the dealer you can lose your warranty. It all depend on the dealer. The dealers that I go to don't have any problem with it and help me out by looking the other way.
Choice of tune would be mind boggling from where you stand as your new.
However the most convenient and elementary tune that is plug and play without getting your hands dirty is the Cobb AP and you will not regret it.
As you grow more in knowledge in tuning and decide to add more power all this will be available for you at no additional cost other than buying supported mods
Later if you want more power like a custom tune thus is also available via electronically, at addional cost, without having to take the car to a shop.
If you decide you want to sell it the resell value is very high.