My friend has been playing for the past 4 months (conidering he plays like 10 hours a week, he's level 83 human paladin right now). His guild is huge with 253. If I become an arms warrior, i would focus just on PvP... even though his clan is mostly PvE but I've seen some of their level 85s with season 9-10 PvP gear.

I use to play vanilla WoW but I quit with 3-4 characters ranging from level 10-20. I got bored probably cause I didn't know anyone in my realm (people in real life). Him and his older brother (a level 60 warrior i believe) are part of this 250 man guild.

He's a pretty high up rank and he raids with his level 85 guild mates.

Would it take long to get season 10 PvP gear, if I start making an account now?
Most of the members in his guild who are PvP are high ranks (some are field marshals)