I have only just got a detail pen after a friend recommend using one for the model in the video and they are great! There perfect for writing on the pages of books and purity seals on space marines.
First off this is a really great kit! Well worth the money and some nice spare parts for your High Elf army. Pretty much staying with the standard color scheme (well so far with the body)
I do use GW's old paints because i have the old mega paint set but here is a link to a conversion chart