Fairy lights are easy to find on Amazon, also fake vines/flowers to hang around. I'll include some links to things I've saved.

https://www.amazon.com/Elephant-Soft-Microfiber-Comforter-Cover-3pcs/dp/B07FVYMWY9/ref=sr_1_4?dchild=1&keywords=cottagecore&qid=1593013856&sr=8-4

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https://www.amazon.com/Psicoactivo-Hallucinog%C3%A9nico-Bot%C3%A1nicas-Impresiones-Mushrooms/dp/B07MVKGGHX/ref=sr_1_5?dchild=1&keywords=cottagecore&qid=1593013856&sr=8-5

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https://www.amazon.com/Mushroom-AUSAYE-Lights-Children-NightLight/dp/B07CWPP4KM/ref=sr_1_7?dchild=1&keywords=cottagecore&qid=1593013856&sr=8-7

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https://www.amazon.com/Unilove-Decoration-Artificial-Greenery-Outdoors/dp/B0167Z3YNG/ref=sr_1_23?dchild=1&keywords=cottagecore&qid=1593013856&sr=8-23

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https://www.amazon.com/Folklore-Woodland-Watercolor-Durable-Beverage/dp/B07M6RYCNK/ref=sr_1_33?dchild=1&keywords=cottagecore&qid=1593013856&sr=8-33

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I also recommend cute pieces of fabric to use as tablecloths on your nightstand/runner on your dresser! I use cute mugs to hold pencils on my desk and my makeup brushes! You can also use Mason jars (Can be found on amazon or at the grocery store).

Don't forget lots of plants and pretty books!