Hey there fella,
for your first question, the difference between @warp and @go is that @warp enables you to go to a specific location in any map while @go warps you to a single specific location where all people warps too.
2nd question, It is best to save 200 vote points and get yourself a fking set for the additional stats.
3rd question, Champion/Sniper/Bio are usually the Top 3 in hunting MVP's. You can actually do the legendary quests with newbie gear, as long as your HW is already maxed