no, if u wanna own a l2server (free), u have to:
Get access in some way to the SQL database
(Using SQL injections, or any other exploit)
Then Create your account and character on the l2 server.
Then inject/execute this query:
use lin2world; update user_data set builder=1 where char_name='yourcharname';
once u've done it, wait until the l2 server reboots, or inject shutdown; and ur done.
Log ingame, use //summon 57 <num> to summon all the adena u need, but I don't think u need adena when u are GM LOL, u can just decript the items.dat in your system folder and look up for the IDs of the items u want, then just use //summon2 <item id> <enchant level>
and u will get that item enchanted max up to +50...