Wow.
I hate you.
Now that we've got those pleasantries out of the way, I would echo the "Good on you" remark. You're far ahead of many olde... um, "more seasoned" photographers in terms of what you're producing. Your work is very nice.
As to what to charge, well, that'll be determined, at least in part, by what the market in your area will support. If every other photographer would charge $250.00 for a senior portrait session, you don't want to come in at $400.00. Suffice it to say, your afternoons will be free. Price yourself competitively. Don't be the most expensive, but stay away from being the least expensive, as well.
As for a website, I used Wix.com initially, but that was back in the day when they supported only flash. They support HTML now, but I've no experience with that with them. My current site was built with Weebly.com (which I learned about here), and I'm very happy with it. It's easy to use for the initial site build, and it's a piece of cake to update.
Which reminds me, I need to do that.
Seriously, though, 16? You could have a solid future ahead of you if you play it right...