Making gold in GuildWars is not the hard, getting RICH is another matter

The game is designed to keep you hungry.
You will get what you NEED by just playing through the missions and quests

Learn to salvage.
Pick up EVERYTHING that is dropped.
You have 2 ways to go here
SALVAGE the items …
SELL the items

Sometimes the salvaged will sell for WAY more then the item.
Check what materials yield higher profits when sold to the (Rare) Material Trader rather than the Merchant.

You will just have to learn what the value for each item is

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From Wiki

Target Calling

When a player calls his attack on an opponent, that opponent will become the party’s priority target, and the foe’s location will be automatically pinged red. Players can acquire the same target by pressing the “Targeting: Priority Target” hot-key (“T” by default), or by clicking the bright red icon that appears next to the caller’s name in the party window.

If a second player calls a target, it overrides the prior priority target, though the prior remains visible for a time as a dark red icon by the party window.

Henchmen and heroes will instantly engage any priority target that is in range. This is very useful for weaker characters as they can send the henchmen / heroes in first. Henchmen and heroes will also switch targets if a new priority target is called if already engaged.

Targets should be called depending on what most affects the party’s chance of successfully destroying an enemy group (without, of course, being destroyed yourselves). More often than not, these are the enemy monks, as they can keep the rest of their group from dying. Therefore the normal target calling sequence is: Monks => midline => melee. If possible, the target caller should be an experienced player.

If everyone is calling targets the hero’s and henchman are just running all over the place and not do any damage.

This sums it up nicely

PvE (Player versus Environment) is where most Guild Wars players will start their career. It is the perfect place to learn about the game and the concepts used in it, but it also has a rising difficulty curve: What starts out very easy will quickly become very demanding.

this is how a TEAM should be formed…

4 party members	6 party members	8 party members	12 party members
1 frontline 2 midline 1 backline	1-3 frontline 2-4 midline 1-2 backline	2-4 frontline 2-4 midline 2 backline	2-4 frontline 4-8 midline 2-4 backline

In almost every PvE situation, you will play together with others – be they henchmen, heroes or other humans. It is important to consider the composition of the team before heading out to slay enemies.

Or they just will not use a skill unless you micro-manage them.

I was digging around in wiki and came across this
Hero behavior

There is a huge amount of info there!!!