Jessica, I looked over your etsy site, and agree with Neilthejeweler.
What you have there does not really lend themselves to casting.
Most of my work is fabricated from sheet, but I do quite a bit of
lost wax casting for those items that are best cast----mainly rings,
and some pendants. Carving models from hard carving wax, or forming
them with soft wax is very relaxing and a change of pace from the
intensity of fabrication.
Often after the model is cast, I do futher work on it such as adding
bezels or prongs for stones, or incorporating the cast piece into
one that has been fabricated from sheet.
Best of all, I can make use of all my scrap silver (and the amount
of scrap really seems to grow rapidly, and it is economically
feasible to use it for casting). The work produced by using my scrap
silver and having been cast more than offsets the cost of burnout
kiln, and a centrifuge. Besides it is a very rewarding technique to
add to fabrication.
Look over your work and decide which you believe are best cast, then
you can decide what works best for you.