Costuming is VERY personal. And people get into it for personal reasons. My best advice: pick a character you're passionate about and learn the skills necessary to make that costume.
Your first attempt will not be perfect, accept that now, but by doing it, you'll gain the skills and experience to do something better the next time. And THAT is why it's so important to pick something you're passionate about rather than just something easy, because something easy ALSO won't come out perfectly your first time out. So it's better to have something imperfect that you're passionate about, than something imperfect you're not.
So, maybe if you tell US what costumes you'd like to attempt, that really inspire you, that you are really passionate about, we can point you to resources to help you create a piece of that dream!
-Nick