I think you’d totally be fine without card, but for me whenever I go to my really big markets I do have a lot of sales in card. It totally depends on where u are and the market you’re at. If you really want to have card then do it!! But I think you should be fine without it as well :)
If you are going to use card payment, I would recommend Square!! It does cost a lil bit but it’s super worth it for me because it’s such an easy and fast way to take card payments ^^ (I see people saying Venmo which I’ve never tried tho so maybe listen to them idk)
And I think bags are optional too!! If customers get a lot of things in one order or just a bigger item, sometimes they want a bag but I find a lot of people just prefer to hold their plushies or put it in a bag they already have and I think that’s just fine :3 and especially if your plushies are small like you said u probably don’t need bags!!
Sorry I kinda wrote a lot hehe but good luckk!! <33