LOL I just realized that you posted here as well as in the Introduction section. This is definitely the right place to ask for advice though, so I'll just copy and paste what I wrote in your Introduction and move it here.
Hope this helps!
Welcome to the cosplay hobby! Nurse Joy is a pretty easy cosplay, and perfect for a newbie. Now, for her dress, apron, and shoes: you can probably buy those without making them from scratch. Of course, you can try making your first cosplay from scratch, but those cosplayers who do that usually have at least a few years of sewing experience under their belts. Since you don't have any sewing experience, I'd recommend you try beginners' projects (sleeper pants, simple t-shirts, pillow cases, etc.) before attempting a really complicated piece like a fitted-bodice dress with puffed sleeves. It's really easy to find a dress and apron like hers though, so you shouldn't have any problems at a thrift store like Goodwill or Salvation Army. Trust me, they're a broke college cosplayer's best friends! For the cap, you can buy a cheapo Halloween costume one online and it should work perfectly. It's a pretty generic design, so you shouldn't have any trouble finding it!
However, if you decide to go ahead with it anyway, make sure you (1) get some basic garment sewing instruction to learn how to use your machine, (2) do a few of the beginners' projects I mentioned above, and (3) buy a good pattern. Also, make the dress with cheap fabric before sewing with the fabric you'll actually use, which will likely be more expensive.
As far as the wig, it's hard to find a wig with that style. So more than likely, you'll need to buy a long pink wig and style it yourself. The loops of hair shouldn't be too hard to make though, here's a Nurse Joy who already tackled this hairstyle
. Her finished costume can be found here,
and you can see that her hair looks great!
Good luck with your first cosplay!!!