Here is a very nice video for beginners. A calm voice and helpful tips.
Q)Can you elaborate on salvaging vs selling?
A) Selling items is literally selling them to a vendor. normal (white) and poor (gray) quality items have no use so they can be sold off for gold.
Magical items that you don't use can be "disenchanted", and the materials are used to make new equipment with random stats, which is a good way to gear up early.
Q)If spells do % weapon damage, then for a wizard or witch doctor, does weapon speed not really matter?
A)Weapon speed on wizards and doctors will effect your casting speed, so it's still a big consideration for casters as well.
Q) If the spell damage scales with the weapon damage, does this mean there isn't any wands anymore?
A) Everything scales off a weapons damage AND speed. Higher damager makes your skills hit harder, but speed it also a factor. Fast weapons let you use skills more frequently. Slow weapons have much higher damage to compensate. Check out the skill calculator and look at the abilities. Basically, there is no such thing as spell damage. It's just weapon damage, and then weapon speed makes you cast faster.
Q) So when you're in a game you're automatically also in the same party as everyone else?
A) Correct. Party and game are pretty much synonymous now. Everyone's playing for the same team.