In the beginning, I highly recommend you have these materials: a journal for your thoughts and reflections, plain paper sheets or a cheap art sketchbook (I love Seawhite of Brighton sketchbooks), a pen, a pencil, colouring pens, a glue stick, scissors and a stash of magazines for collage materials.
As you begin working with creative and mindful arts, you might like to explore working with other materials. I am sure your creative spirit friends in the community hub will share their favourites: I like to work with oil pastels and gouache, but also have acrylic paints for when I really want to get messy.