Load your film. Miscellaneous Outdoor light is inconsistent in most areas, but you might experiment with it in a pinch. I set up with the artwork facing the open door on a bright day. Once you get the hang of it, you won't have to shoot so many slides. Try to shoot as many originals as you can, especially if they might be used for reproduction.
Duplicates are never as sharp.
For best results, always take your film to a professional color lab, not a one-hour photo processor. Group your paintings by size, so you don't have to move the camera or easel around so much. If you work in a standard size, place tape on the floor to mark the position of the camera, lights and easel or art stand. It will save you time the next time. The best reference I've found is Photographing Your Artwork by Russell Hart.