You have brought IPB, you just need to wait for your account to be activated (can take 2 working days).
Once you have your license, you need to contact IP to install it for you (Open a ticket)
They will then install IPB for you, and you have created a website.
Once you have brought the forum software, you will have to wait for your account to be validated (Wait for payment to clear), if you pay with paypal this normally goes faster. And once you get an email from IPB you can open a support ticket to request it to be installed, or install it automatically from the client area.
have you brought and paid for the forum software ($149.99) already?
You only have to pay for 1, the board license, at $149.99.
if you mean the hosting, no, if you have hosting you can use it already! The domain and the hosting are not the same, if you have a domain you still need hosting.
For that $267.72 you will get the forum software, yes.
Godaddy meets the minimum requirements, however the oversell fairly bad so I would not recommend them, as I said, look on http://webhostingtalk.com/ for hosting.
Okay, then you will need gallery as well, so what you have is good!
We cannot advertise hosting services here, as IPB do their own hosting.. http://www.invisionpower.com/hosting/. If you do not wish to host with IPS, your best bet would be to read reviews of companies on http://webhostingtalk.com/