The yellow Toner Ebay paper works fine. I also 220 grit sand the copper
before applying via the laminator so the toner does a 100% transfer.
Don't handle the cleaned copper with fingertips, you need it clean for a
good transfer and etch.
Have a look at my page on this with the 23 sequenced pictures (files
section) and videos detailing the approach via 9+ steps.
https://hackaday.io/project/7938-pcb-smt-maker-lab-homeAncel