If you're not sure, just read some of the other intro posts to get an idea. Most of them introduced their character both personality-wise and skill-wise, showing how they see the world and what it is they're good at.

If you need a location, Red-6 is where we're all meeting so you could start there if you want. Maybe run into one or two of the others once they get there (or if they already are). Just work it out with them before you do.