Uno, Motor Shield and Stepper Motors - required voltage and amperage

I noticed there are some vendors on Amazon and elsewhere selling "starter kits", e.g.

https://www.amazon.co.uk/Zerone-Printer-Stepper-Controller-Arduino/dp/B07JHRCNDM/?_encoding=UTF8&pd_rd_w=9I0Lf&content-id=amzn1.sym.386c33bb-9a6d-4a4d-9a06-3bb24cb22d5d%3Aamzn1.symc.cdb151ed-d8fe-485d-b383-800c8b0e3fd3&pf_rd_p=386c33bb-9a6d-4a4d-9a06-3bb24cb22d5d&pf_rd_r=8HFR8GM1V08M9GB9XJVG&pd_rd_wg=Gs2nl&pd_rd_r=77ad046f-143b-411f-ac4c-d0e0e6a567bc&ref_=pd_gw_ci_mcx_mr_hp_atf_m

which might be quick way to get started. You just need to add a 12V power supply.