WARNING! LOTS TO READ IF YOU SERIOUSLY WANT TO LEARN!
Hello. Glad to hear you are enjoying Guild Wars so far! Two quick things before i answer your questions... First, i commend you for not starting with the run-of-the-mill Warrior/Monk. Second, Since you are still fairly new to GW and perhaps this website, just a heads up, this site has a Search Feature. The link is located at the top of the webpage and right above the forum section along with other options. Now that you know its there, you will definitly want to use it in the future, not only to get great info fast, but so that you won't get hounded by the forum trolls (mean people). So after all that text to read here are some answers::
1) Value is usually placed in specific details of a weapon. The most basic starts with being max dmg (Axe = 6-28; Sword = 15-22; Hammer = 19-35; Staves = 11-22; Wands = 11-22; Bows = 15-28). Second, are the damage modifiers most sought after are: +dmg(15% max)% damage while health is over 50%. Third are the Preffix and Suffix modifiers such as a
Sundering Stormbow of
Fortitude (+10% Armor Penetration (10% Chance) and +30 Health). For more information of valuable weapons, modifiers and upgrades just visit the Auction page and look at all the currently high bid items for an idea of what else is worth a lot!!
2) You are on the right track. Thinking as a warrior you want to be first in to try and take the most dmg from monsters. However, the game, like others, has Artificial Intelligence, which attempts to emulate human intelligence. This means they will often and almost always do things different (other then there patrol route, and other small things). The best way to maintain a pretty good aggro, is when you go to aggro monsters and get thim in your "aggro bubble" try to make sure that NO ONE else in your party is even close to your bubble. Make sure that their bubbles arent even TOUCHING yours because this acts as an aggro chain for the AI to see multiple targets with which it uses to prioritize targets. If your the only aggro bubble they see, then they will initially only attack you, but often a few will break off when your party comes in to help...
Another way to keep aggro off casters/healers, is for them to use AoE (Area of Effect) spells, like Symbol of Wrath, or Firestorm. After about 1 or 2 seconds this sends the monsters running, which they will then target new players.
3) Refer to answer #1 or the Auction page of GwG!
4) There is no obvious way to see your adrenaline build. There are no indicator bars to show you how much you have build up, however, if you equip adrenaline using skills and begin attacking a monster then you should notice that a "fog" on the skill icon seems to shrink down with each hit you strike with. Once you build enough adrenaline for that certain skill, you will see it fully light up/clear up meaning it is ready for use! I hope that makes sense. Just go equip some adren skills, go outside and bash on some monsters, while watching the skill icon. Then you will see what i mean...
5) Somewhat. You will not be able to see the Skill listed as affecting a certain monster/player, HOWEVER, if you notice when you target an enemy, that at the right side of their health bar are sometimes different colored arrows. They all mean something different. Pink down arrow means they are hex with something like "MArk of Pain". However, this means they have a hex or HEXES on them, so you will not know if your hex is still on them, or if it is another hex from some other source. Light brown down arrows means they suffer from a health degeneration condition, and Green arrow up, means they are under the influence of an enchantment.
6) For solo builds all you have to do is go to the Campfire (forum section) and you can find solo builds under the Monk section, Warrior section, Necro Section, Mesmer section, well really all the classes...
Hope that all helped! i know it was a lot to read, and im sure with this amount if time i took, some1 already gave a few hasty remarks. So i am hoping this is good and complete enough for you to have all the info you need! If worse comes to worse, i can refer you to the Search Feature again! LOL!! Enjoy!
EDIT:: WOW!! When i started writing this, NO ONE AT ALL, had posted yet.... As you can see, you have LOTS of people who like to help! This makes me feel warm and fuzzy all over!! LOLZzzzzzzzzzzzzzzzzz