I not really familiar with car kits but you can refer to this shop and they do postage too.
https://www.facebook.com/myotaku.com.my
Mainly because we have this pinned post:
https://forum.lowyat.net/topic/488910

Also you can google the tutorials anyway.
Primer is essential for acrylic and enamels since they aren't that resilient like lacquer paints but still need to handle painted kit with care since it will eventually worn out if moving it too often.