add new lines to a table, when user register

[basketmen]

Hi guys, i am looking for a product or thread about this, but still cant found it yet

so when user register, i need to add new line to a table, for example
i have a customtable in database
the user is register & the userid is 10
i need to add this line in customtable :

userid : 10
friendid : 1 (this is constant value that i set)

maybe using a plugin, with register_addmember_complete hook?

please help if you can, GBU for replying

--------------- Added [DATE]1386005901[/DATE] at [TIME]1386005901[/TIME] ---------------

update, i already get the code for the plugin, its like this

PHP Code:

$vbulletin->db->query_write("INSERT INTO " . TABLE_PREFIX . "customtable 
(userid, friendid)
VALUES
(1, " . $vbulletin->userinfo['userid'] . ")
"); 


the problem now is only what hook i need to use?

- using global_start is working, but its inserting more than one lines for each member, only need 1 line for each member

- using register_start, the line is created, but userid is still not created yet, still get 0 value

- using register_addmember_complete, not working at all



please help guys, only which hook question i need to choose now