If I purchase this Tumbler what accessories would I also need? Grit mediums and does it come with procedures for different types of rocks banded iron or jasper?

I would recommend getting the SKU#0-0050 Large Abrasive Grit Kit as that will be a good kit to get you going. We do include some instructions on general tumbling but if you're looking for more specific tumbling instructions and knowledge you might want to look at purchasing the book, Modern Rock Tumbling SKU#2-0007. If you have further questions please email sales@kingsleynorth.com and we can help you out.