Guild Wars 2

Hi. I was searching for answers but cant find. My questions are what “world selection” can give me, change on my account? Mean i loose friends, guild, items etc. and if i decide to come back ill have everything with friends, guild ?
2.What sie best choose for character in NY? Now im in Sanctum of Rall which is i dont know where. But if ill be in NY im gonna have better ping and ill be better then ppl with higher ping -right? So which world i should choose in or near NYC?
3. How many ppl using gems, this is popular ? i mean is buying gems make a sense ? Its something new for me bcs never bought in game for real $ and dont know what to think about this.
Thank You

Sanctum of Rall is great choice, and is intended for people in North America.

You can go your whole career in GW2 without buying gems. If you decide you do want gems, you can buy with real money or in-game. So far there’s been nothing anyone actually needs in the gem shop to play the game, only things like funny costumes, dyes, and things like that.

The most useful things you can get with gems are expanded bank, bag, and character slots.

What about Black Lion Key? i have already 12 Chests. That can be nice upgrade at one time and what price is good for buy gems or its alwasy same price?

I don’t think Black Lion keys are worth buying, unless you find it fun. Inside, you’ll find some random consumables.

Buying gems with real money is, so far, always the same price. Who knows if someday they’ll have a sale on them.

Buying gems with in-game gold is a somewhat contrived market-based system. The price fluctuates with demand. So far the price of gems seems to go up when there’s an event, and has an inflationary trend.