1. from lvl 1-15, you'll probably won't find items that are worth something :/ maybe 1 fg ^^ but if you don't know, there is a price check forum :
http://forums.d2jsp.org/forum.php?f=91 ;)ยต
2. yes, here is the list

Quote
Listed In Order Are The Item Prefixes
Magical
Rare
Mystical
Angelic
Mythical
Arcane
Legendary
Godly
Epic
Relic
Artifact
Unique
3. well, you need dext aswell as you need str

try to keep a good balance between dext and str, although that little more str than dext is adviced

so keep lvl your dext until ~ 100-120 dext ( with gear on )
then rest into str

nothing in vita and nothing in int

4. on armor if you go catacombs (mutliplayer ) , then you better look for an heavy EE armor

or str armor
on charm, look for dext or Str

about EE :
Quote
+ % Enhanced Effect Also Known As EE, this increases the base stat of the item by the percent listed.
Weapons = More Damage, Armors = More Defense, Charms = More Power, Glyph = More Duration
from here :
http://ladderslasher.d2jsp.org/index.php?g=15 