Paper Info: We currently print all of our stickers on glossy white, permanent (non-removable) sticker paper and some kits have option for removable matte with color laser printing. It prints with beautiful color and has an amazing thickness and weight to it. The stickers come off easily.
For pen use: I have not tried all the pens so please email if you find some that you love. Below is a list of what I have found work best. I am not affiliated for these links; they are just recommendations.
Sharpie Pens (ultra fine, fine, retractable) I use these a lot.
PaperMate InkJoy Gels
PaperMate InkJoy 300 RT
Prismacolor markers - you can color with no drying time (AMAZINGLY FUN)!
(Staetler Gels do NOT write well on glossy paper.)