Go with what you want to do, but make sure it’s.. simple, if you’re making it. My first cosplay was bought. But the first one I made was pretty much just a jacket with frills sewn on (everything else I already had). Pretty simple, but still easy to mess up. Darn those sleeves.
For making your cosplay, I recommend you read up on how to sew and everything. If you have a friend or family member that can sew, ask if they’ll work on a few small things with you. Learn to stitch and seam and add buttons or whatever. Write down notes or even buy books. Or just copy and paste what you find on the web. If you want to be a Hot Glue God/Goddess, learn the tricks of that too (I’ve known people to make amazing things from just hot gluing it).
But, I still recommend you learn the basics.
Try cosplays that you might already have most things for, but you just need to make a small vest or paint a shirt or make your props. Closet cosplays are fun and great for first timers! And it lets you relax while you learn and plan for more complicated stuff. Especially at cons when you can ask others ‘how did you do that’ or attend ‘how to cosplay’ panels.
Good luck! And sorry I got to this so late. I have four blogs and sometimes I forget to check all the way through my inbox.