Rangers need high health regen and endurance...they WILL take alot of damage, so invest skill points into regen BEFORE targeting. Also, make sure all characters have quicknes above 60...you'll want the first shot when facing Minotaurs and Gorgons! Another important skill for support characters is Health drain (vampiric). You will gain a ton of health when hitting Minos and Gorgs if you use the hunter shot (double damage vs. Deep Creatures). Beyond that, have fun! You will occasionally have to flee if you make a mistake and you may even wipe a couple times...it's not the end of the world (unless you're on hardcore). Keep practicing and you'll soon have a party with GREAT Legendary gear!!!
Rather than posting a list of gear, I will just say that before you start farming you need 100% stun/poison resist for the warrior (if the group wipes the Warrior can usually solo a Pandora's box if he's geared right) and each of the party members. You don't want to mess around casting buffs in the fight if you can avoid it.
Also every nine levels, the stat Orbs advance another level (ex. Dex+2 on lvl 9, Dex+3 on lvl 18...). It is on these levels that I recommend you clear the fights and use all of your portal scrolls - save ONE for selling stuff after you farm - to buy LL, PB, stat pots, Uniques and orbs (I buy about 8 toxic orbs, protection orbs for warrior until i have 99% damage reduction then strength/endurance - endurance/regen for Rangers - Intel/regen for Mage). I farm every nine levels because you will get gear and orbs of your CURRENT level, and since you're taking on tough fights, you want the best items you can get at the time. Gearing up can be tough, but that's my favorite part of the game!
FARMING PANDORA'S BOXES (PB) and LEGENDARY LURES (LL):
I use 1 Warrior 2 Rangers and 1 Mage (3 Rangers is alright as well but I prefer the mage because I find it easier to gear everyone and it suits my playing style). First thing to do after the first few levels - once you are geared well enough to easily survive the mini-boss fights - is to buy the Badge in the market that allows you to teleport to the market once per level BEFORE you start collecting LL's. This enables you to access the store often, giving you access to LL's, Orbs, and stat potions (save ALL your stat pots for PB's) and I recommend using it EVERY level whether your inventory is full or not. Also, after you have your market badge, save ALL of your portal scrolls for later use. On the Den of Terror campaign (haven't tried on Corruption), every ninth (9, 18, 27,...) level, you fight a special boss (after you complete the quest), either the Dreadfather or the Replecator(?). (cont'd)