Some things I do know -
After you join, First, you get a bunch of Boards. You can rename them what you want, but be sure to classify them, so people looking for pictures in certain subjects will see yours.
To put stuff on the Boards, you can type in urls for your own blog or website and pictures will come up, from which to choose. Make sure you have the rights to what you want to share. You can Pin pics onto your own Boards, and somehow people might notice where to go and decide to go there, although many just like looking at the pretty pics and do Likes or Repins onto their own Boards. What's cool is your Boards can also show up on Google searches. There's a space under your pics for comments, which you or someone else can make. I haven't done too many, but probably should start doing so.
Somehow once I joined Pinterest, emails started coming in with people following my Boards, or Liking my pins, or Repinning my Pins. When I get one from someone I'm not following yet, I click the email to follow that person.
If you choose to do so, you can sign in with Facebook or Twitter and specify that your pins show up on those sites as well.
There are other possibilities, which I have yet to figure out, such as using hashtags (#) or @ like in Twitter. I'm not sure how that works, but maybe someone reading this will enlighten all of us on how that works.
Here's my Pinterest Page, if anyone wants to follow me. Those who already belong, if you wish to mention yours, please do so in the comment section here.
I had to receive an invitation to join Pinterest. I'm not sure if that still holds true, but if you have trouble joining, send me an email at morgan@ morganmandel.com with Pinterest in the subject line and ask for one. I'll be glad to send one off to you.
There's even an app for the iPhone, so you can play on there when you get bored. Pinterest has possibilities, but more than that, it can be relaxing and less stressful than weeding through some of the comments that can crop up on FB and Twitter. I recommend you give it a try.