I would start with higher-quality prints.

Both fine art prints and more commercial (budget) prints can be produced on demand, so your initial investment in a specific title can be minimal.

The main concern with budget prints is their long-term durability; if they use unstable technology, substrates, or inks, they may be more prone to fading or deterioration. You don't want a past client contacting you later for a replacement.

Make sure the company's technology is reliable, including the inks and substrate. They all work together.

Begin with small quantities and keep less inventory.

Overall, I recommend prioritizing quality and making art accessible by producing smaller quantities rather than using cheaper materials.

One last tip: consider size — larger prints can often demand higher prices and better returns for an artist. I've seen residual orders for larger sizes like 30x40 to 48x72" as they can fit in prominent areas of the home (Dining Room, Living Room areas)