Just search “base” and click on “name” you’ll find multiple base figures that you can use to make your first character design.

For ideas, that is rather vague. But if you mean in “what should I do make my oc my own and not generic?” . Just make them however you want, i.e: sci-fi clothing, modern clothing, medieval, fantasy. Go wild, mix and match making it sci-fi/medieval combo.

If you do use a base figure from the site, just make sure to mention you used it from said individual. In other words just give credit to the author of original base figure creator.