I would recommend looking through previous forum posts. There are lots about mothing setups including specifically about sheets, some examples:
https://forum.inaturalist.org/t/moth-sheet-what-about-the-sheet/32031
https://forum.inaturalist.org/t/cotton-vs-polyester-sheets-which-is-better-for-mothing/23617
https://forum.inaturalist.org/t/amateur-moth-trapping-in-the-big-city/53621
https://forum.inaturalist.org/t/moth-trap-tripod/52460
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