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If you mean you had just purchased the plant, then one of them drooped, the most likely cause is needing water. Here is an article on gerbera daisies: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm
Gerberas don't make a very good houseplant, because they need a lot of light and room for their roots. But this article on houseplant care will help you if you're determined to keep them in the house: https://www.gardeningknowhow.com/houseplants/hpgen/basic-care-of-houseplants.htm

This article should help: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm

Holes in leaves are normally the work of slugs, which come out at night and are, therefore, rarely seen. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm

Yes, you can deadhead these plants. That being said, rather than simply pinching back the spent blooms, for daisy varieties that produce single stems per flower, such as Gerbera,, it’s better to cut the individual stem back to the base of the plant. If all the blooms are spent, simply cut the entire plant back to the base. This will stimulate new growth and additional flowering.

You can cut the daisy flower any place along its stem, from just under the flower head to the bottom where it emerges from the leaves. Here are some more interesting facts about gerbera daisies: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm

You may have placed the plants too deeply into the bigger pots, or the water is staying in the new soil rather than getting too the roots, or the new pots are too large and the plants are staying too wet. Here's some more information on growing gerberas: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm