A Few Things To Fix/install And Advice

[V(35)Powarh!]

Hey guys i have recently purchased a nissan skyline 350gt v35 2004 coupe and i love the darn thing, just a few noob questions i have if you could assist me it would be grealty appreciated!

first thing is i have 2 original sets of keys though the central locking buttons and boot release doe not seem to work and is bothering me quite abit, just need some hints/tips before i go and take it for further investigations.

the lock and unlock buttons seem to work fine when i open the doors manually with the key however the buttons on my remote do not work and i have replaced new batteries in both! please help with suggestions/advice

also the door lock sitwch on the drivers side works fine when locking unlocking however when i press to lock only the passenger side locks but not the drivers side and when i unlock both unlock fine....please help with suggestions/advice

also i am located in sydney so if anyone could advise me on where or who can install a radio expander for my car? or where i can purchase one and go to get installed? also how much this would cost me?

also seeing as i dont know much about the car myself when the vdc off is displayed on the speedo it means it is off right? lol just want to set things straight, also when i start the car the "slip" button lights up for a split second and when i am fanging the car the slip display lights up for a split second as well, advice please

i dont have a reputable mechanic i go to and i want to get my car serviced on a regular basis, any suggestions on mechanics in sydney (preferrably south west sydney) or garages that work on these types of cars in particular who know there stuff?

and lastly for now, what oils/spark plugs am i looking at to replace? my car is a 6spd and has done "36k" kms lol well who knows what it is ay

thanks heaps for your help/advice/input....

[spencer?]

http://www.ebay.com.au/itm/360149158435?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

for spark plugs oem are just normal i believe iridium is just better especially at this price rrp is ~20-30 each

[V(35)Powarh!]

thanks mate, how often do you replace yours?

[Vimana]

im pretty sure this car has platinum plugs which only need replacing every 100000kms

[V(35)Powarh!]

help please?