My phone came with some battery power, do I need to drain a bit or charge direct before use? And how long should I charge my phone the first time? Do I need to go over 6 hours?
Batteries are good to go from the manufacturer. I just use right away with my regular charging habits. So I'll run it down to ~35% right out of the gate, then charge.
Welcome to Android Central! One of the main reasons to charge your phone when you first get it is that the setup process (including installing all of your usual apps) can chew through a lot of battery. If the phone also has a system update to install, it will probably tell you that the phone needs to have at least 30% battery or so before the update will install (since loss of power during an update can easily brick the phone).