Something to paint on - canvas or board.
Something to prime it with - acrylic house paint will do fine. Professionals use Gesso.
Remember - paint is basically coloured glue. Surface preparation is critical. Some
base-boards (like wood) expand and contract over time. A well prepared base helps
to buffer this.
A charcoal stick for sketching prior to painting on top.
Somewhere safe to store wet work.
No cats or young children in the way.
A palette - you can use a white tile.
Solvent for cleaning brushes.
Soap - for cleaning the solvent off the brushes.
A medium like liquin or linseed oil (or both). Liquin speeds up drying.
Paint. You don't need black really. Dark brown and strong Blue will make a good black. You need white.
You can add as many colours as you like, but choose 6 to start with: a cool blue, warm blue, cool yellow, warm yellow, cool red, warm red. Many artists use only this or fewer colours.
As you get more experienced, pay attention to transparency and permanence.
Try to buy artist quality paints. They are more economical in the long run because they have more pigment than 'student quality'.
Paint in layers. Thick over thin otherwise it will crack.
Picture hooks and wire.
Then maybe a book on composition and/or techniques and one on colour theory.