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Hey there, and welcome aboard to FFXIV, the RPC, and to Balmung! 
As someone who also came out of leading RP-PvP guilds on Moon Guard back in Wrath, there's not really any RP-PvP presence at all in FFXIV. Your options for resolving conflicts are limited purely to /random fights and improvised RP combat. It's kind of a bummer really.Â
I think everyone else knocked out your questions already! That said, your question about character concept viability depends on the niche of the community you go into. Some areas of the community are pretty job-heavy ("epic characters" if you will), whereas others keep things very mundane without any jobs and just classes being RP'ed. In my experience, "heroic jobs" are limited to more insular FC's and classes are more commonly used by the overall community (or the areas I've interacted with, at least). So, I'd probably recommend keeping it fairly mundane to start with and grow into the "heroic job" in the future if you find yourself in a niche that caters to that role. Otherwise, you'll end up with a power disparity between your character and others, which may cause some issues.Â
Regardless, best of luck on the hunt!
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As someone who also came out of leading RP-PvP guilds on Moon Guard back in Wrath, there's not really any RP-PvP presence at all in FFXIV. Your options for resolving conflicts are limited purely to /random fights and improvised RP combat. It's kind of a bummer really.Â
I think everyone else knocked out your questions already! That said, your question about character concept viability depends on the niche of the community you go into. Some areas of the community are pretty job-heavy ("epic characters" if you will), whereas others keep things very mundane without any jobs and just classes being RP'ed. In my experience, "heroic jobs" are limited to more insular FC's and classes are more commonly used by the overall community (or the areas I've interacted with, at least). So, I'd probably recommend keeping it fairly mundane to start with and grow into the "heroic job" in the future if you find yourself in a niche that caters to that role. Otherwise, you'll end up with a power disparity between your character and others, which may cause some issues.Â
Regardless, best of luck on the hunt!