Guild Cape?

I created and registered a guild. My question is, what are the quests do I need to complete to unlock the "Guild Emblemer" to make a cape ?

[wiki]Guild Emblemer[/wiki] - you don't need to do quests, you just need to get to the right places. Unless you're in Pre-Searing Ascalon City, in which case you need to get to Post-Searing.

I am kinda new to Guild Wars, but what is "Post-Searing" ? to my understanding someone or something attacks the town? so how do I get to that point to find the "Guild Emblemer" ?

Pre-/Post-Searing is the start of the Prophecies game (original GW). When you are done exploring, leveling, collecting skills, etc in the starter are (pre-searing) then take the quest to enter the academy to move to post-sear. The story will unveil itself at that point, no need to spoil it.

The Emblemer is available in post-sear Ascalon city.

[wiki]Academy_training_quests[/wiki] are the ones that will get you out of Pre-Searing, but there's no rush. Capes won't do you much good.

Thank you for not spoiling it. How big is this game map wise, is it massive? Right now I am only in Ascalon City area doing a few quests, and I love it so far.

It's very large, you could say massive. You have only scratched the surface so far. Enjoy the ride.