now sign up for the priest of dawn for seven signs to get access to catacombs and necropolises.

DUAL BOXING BASICS in Lineage2 Adena
First of all you will need to invite yourself to party, easily just type /invite (name of your alt) and then accept invite with your alt.

then you will see your alt name below your main name (and on other screen will see like that the char you're on above and your other char below).

basic controls:
1 Click on the char name below yours = select the chosen char
double click on that name = set Auto-Follow on that char
right click on that name = Assist party member by selecting the enemy he is selecting
double right click = Attack the same target

as you may know so far you can put your abilities in small boxes as shortcuts (with F1, F2, F2 can execute them) if you click the icon with 2 arrows up you will get another line, to easily access that line just use CTRL + (number of the "F" its on) for example
CTRL + 1 = doing the action set on 2nd line for F1, i doubt you will get to use more than 2 lines this way so just explaining the basic.

LEVELING in Lineage2 Adena
NEVER FORGET STARTER BUFFS;
VAMPIRIC RAGE IS THE KEY FOR THIS TO WORK OR YOU WILL DIE A LOT

now leveling, head to the necropolis of sacrifice, you will start getting to a big room with:

2 Giants
2 Liths
2 Skeletons
2 Undeads

before starting buff yourself (Might, Focus at the beggining)
now put your mage in a safe area.

with your melee
you can aggro the skeletons, usually that aggro all giant and liths near, but if dont aggro those may have to hit them, pull them to a corner and then start killing them (if you got a Pole ability like sweep open with it) after a couple hits if you start to run danger your mage alt can start healing you without getting much aggro, just be sure to keep changing targets when they die so you can hit and keep recovering HP.

i have seen both life cubics will recover your HP, so in a way you will be safe.