You have many options for supplies depending on your purpose.
Things to consider are:
silk dyes or silk paints
setting silk by iron, steam, chemical
resist such as gutta, water based resist, solvent based and how to remove or leave in
I recommend you read books or save yourself a lot of trial and error by taking the Online Silk Painting Course.
Here is a free sample class on materials: CLICK HERE
My magic pens just don’t work. The ink disappears too quickly. I use a bit of vine charcoal or charcoal pencil to transfer my images to silk. Used lightly, they wash right out of the silk. Its great because I can spend a day transferring my work for the week, then just move on to gutta and painting whenever I like.