Hi Istvana - thanks for the interest! To answer your questions:
1) We use both typing in game and Discord pretty equally. For running ops and some other group stuff (FPs, random groupings, etc) we tend to use Discord voice, but it's by no means required. We have a few dedicated ops raiders who just type and do fine (or just listen in only on Discord and not speak).
2) We welcome all players regardless of level or experience. We're mainly PVE focused but do lots of different stuff, including ops, flashpoints, conquest, dailies, etc.
I think you would find us a pretty good fit actually. You're welcome to stop by our Discord or just whisper someone in game if you want to check us out